Essence of the Alicorn
You now have the ability to transform an alicorn pony from My Little Pony: Friendship is Magic. You have no issues getting used to your new alternate form, and know how to cast every spell ever shown in the show, movies, comics, or any official side content.You start out as strong (and as tall) as Princess Celestia. Your magic is like a muscle, allowing you to increase it's strength with training and testing the limits of your spellcasting capacity.
You get to pick your special talent, which will be reflected in your cutie mark. You will naturally be better at any activity involving your talent in some way.
You have the ability to permanently transform mundane equines into their sapient counterparts as they are depicted on the show through direct physical contact. In the case of races that obviously don't have real-world counterparts such as unicorns, pegasi, hippogriffs, bat ponies, and so on, then you can still make them from bog-standard horses. However should you be in a world where they DO exist, you will find that they will be of a higher 'quality' if you choose to transform them, compared to those made from normal horses. You can also make sea ponies, mermares, and sirens from sea horses. Hope you have a really big pool in that case, though. Those you transform will be absolutely loyal to you, and regard you as royalty.
You can decide a pony's special talent as you're transforming them, or leave it completely up to random chance. But for straightforwardly 'powerful' talents like for example Twilight Spark's affinity for all magic, it takes a proportionate amount of energy to create a pony with that talent. This means that if you wanted to create a unicorn on par with Twilight, you would need A LOT more energy than you would use to create a relatively average unicorn like say Rarity.
You can create other alicorns, but those take even more energy than freakishly powerful unicorns. While still absolutely loyal to you, they regard you as a beloved parent or older sibling rather than them being another loyal subject. The other ponies you make will also similarly regard them as royalty.
Those you transform will also have the ability to assume 'human' forms reminiscent of the world of Equestria Girls. So they generally won't be able to pass as actually human unless you're in a world where rainbow-colored skin is normal. But hey, you can try to pass it off as a freaky skin condition? Maybe it'll work?
Essence of the Keyblade.
You gain your very own Keyblade just like the ones from Kingdom Hearts. It's default form can be anything from the games as long as it isn't Ultima Weapon (or Omega Weapon), or even something original of your own design.
A body just above the peak of your species in ability, one sculpted to your tastes and tougher then it should be. This body can grow in ability and durability through training.
You gain the ability to use any magic seen in the series, but you start out knowing how to use none of it. Your magical reserves start out small, but grow over time when frequently used.
You gain a downright supernatural ability to learn practical skills 'on the job'. Whenever you face a difficult trial and succeed, you will be able to derive a spell or technique relating to the challenge in question at a level slightly below that of the challenge itself. For example defeating a powerful fire demon would grant you Fire, Fira, Firaga, or even higher levels of fire magic should the threat be great enough. While fighting skilled swordsmen would allow you to emulate their techniques with your Keyblade. You can even develop Keyblade Transformations on your own once you reach a high enough level, and if you fight opponents with similarly transforming weapons.
Speaking of Keyblade Transformations, if and/or when you develop the ability to turn your Keyblade into a Glider, you can travel to any fictional setting on it. You're not limited to just Disney or Square-Enix properties.
Furthermore, you can 'meld' two or more sufficiently mastered techniques and/or spells to create stronger skills and spells. However these new abilities are learned at a base level, and take time and experience to be mastered enough to be melded again.
When you perform the Keyblade Inheritance Ceremony one someone, you can guarantee that the recipient will one day gain their own Keyblade. This can be toggled.
You can acquire Keychains to temporarily change your Keyblade's form and abilities, after having a short adventure in another world. Even normal physical objects can also become Keychains if they have enough emotional sentiment attached to them. You also know the recipes to synthesize the various Ultima Weapons (and Omega Weapon), you just need to acquire the materials the old-fashioned way.
You have a special form of perfect memory with infinite storage that prevents you from being reverted back to 'Level 1' like Sora. Whether its having your memories erased, being in a year-long coma, nearly being possessed by an evil master of darkness, or having to lose them to take an exam. Thus, any powers or skills gained through this Essence will never degrade.
You also have the capacity to use Light and Darkness, but this Essence provides no protection against the corruptive influences of the latter. That's something you'll have to build up on your own, like Riku did.
Lastly, you have the knowledge and skill needed to create supplemental equipment like Black Coats, Keyblade Armor, or even the various magic clothes made by the Three Good Fairies.
Essence of the Perfect User:
By drinking this thick, sticky, rainbow-colored Essence you become a perfect match for any sort of magical or non-magical artifact that you come across.
You're not just able to use and bond with these tools, you're able to draw out several times the power that anyone else, even going beyond what the item should normally be capable of. If they require a special energy source that you may not have access to at the moment, you can still power them using your own internal energy. Of course this doesn't actually give you enough internal energy to power every item you pick up, so don't use this function willy-nilly or else you might accidentally drain yourself dry and die.
You also exude an aura of 'worthiness' that causes weapons who seek such individuals to abandon their current wielders in favor of you. This can be toggled on-and-off at will.
Figuring out and mastering all the functions of an artifact is incredibly easy, even if you've never heard of it before.
Once you've bonded with an item, you'll be able to prevent anyone else from using it as well, although it might take some time to complete the process, depending on how powerful the item in question is. The more powerful it is, the longer it'll take for it to be permanently tuned to your soul.
But once you've done this, you can summon these items to your hands with just a thought and store them within the depths of your very soul. They also self-repair if damaged. Even if they are completely destroyed with no trace left, they will still recreate themselves from nothing with enough time as long as you are still alive.
Essence of Godzilla:
Those who drink this Essence will gain the power and form of Godzilla, King of the Monsters.
As there are many iterations of the character, you can pick any of his appearances to take on or possibly even create your own if you desire, as long as it is still recognizably Godzilla.
You start out about as strong and as tall as the Godzilla from the original 1954 film regardless of which character design you choose, but as you age you will get bigger and more powerful. To give you an idea of the rate at which this progress occurs, it would take 20,000 years for you to match Godzilla's strongest incarnation, Godzilla Earth, in raw power and size.
However the process can be sped up by feeding on radiation, which you are now immune to the negative side effects of. Your internal biological cooling systems are such that you would never experience a nuclear meltdown.
Doing this would also allow you to develop the unique abilities of specific versions of Godzilla, like Shin Godzilla's hyper-adaptability (minus the painful and grotesque mutations unless you actually want that part) or Godzilla Earth's ability to spawn new life from damaged and cast off flesh due to his cells' incredible regenerative capabilities. Potentially you could even develop something unique to you. But you have no control over what abilities you get by feeding on radiation.
Lastly, regardless of your biological sex, you are capable of laying eggs at will containing infant Godzillas through asexual reproduction. These children are naturally predisposed to love you, but like any normal child if you treat them poorly that will change.
Essence of the Rival Magnet
Those who drink this spicy red Essence will forever find themselves encountering hyper-competitive individuals who'll want to fight or kill them for one reason or another.
These rivals will always be equal, slightly above, or slightly below you in strength and skill. Their abilities will be similar to yours. They will more often than not be foils to you in some way.
Even if it doesn't make sense in a hypothetical scenario when you're astronomically stronger than anyone else in the world you're currently in, Fate will conspire to create at least one for you to deal with and it'll be very difficult for you to prevent this.
Your rivals have a similar growth rate to you, and will be constantly aiming to get stronger, so if you slack off they will surpass you with ease.
While you can certainly kill these rivals, you will never be without at least one active rival for more than a year at the very most. It's easier to just simply have 2-3 around that you like. That'll usually stop this Essence from activating and creating more. In addition if you have some sort of Plot Armor then so do they, and theirs will be just as strong as yours is. So killing a rival will always be a hassle.
It is not impossible for you to befriend a rival, but it'll be incredibly hard to pull this off even if you have enhanced charisma of some kind. Plus you'll usually have to beat them in a fight beforehand. Even if you succeed they'll still want to get stronger and compete with you, they'll just be friendlier about it.
Essence of the Avatar
Those who drink this golden glowing Essence are forever merged with Raava, Spirit of Light and Peace, becoming the Avatar.
You have the ability to bend all four basic elements (water, earth, fire, and air) but start out as a master of only one of them. The others you will have to figure out on your own or find teachers to help you learn how to control them. You can learn the more advanced versions of each bending style, but that will more than likely require a teacher to guide you.
You can teach non-benders how to bend the elements, but they can only learn one and in order to teach someone an element you need to have mastered it yourself.
You can access the Avatar State, but because you are the first Avatar in your line all you get is the full power of Raava with no skills or knowledge to draw on. Of course this means that when you die, you will be immediately reincarnated but sadly with no real memories of your past lives without any sort external aids to assist in the process.
However your next lives will all possess not just the abilities of this Essence but any other Essence powers you may have. Yet if you have some means of cheating death and coming back to life, the reincarnation will not occur until your true final death.
Essence of Dolls
By drinking this essence, you have obtained the ability to give life to dolls
Whenever they are toys, PVC figures, Figma, Acrylic Stand Figures, or etc, you can use them to summon the characters they are based on and have them serve you. The figurine will disappear once you do that. The character that comes to life will have all their memories, powers, abilities, personality, and grow to their original height from the series they are in.
By touching a figurine, and consciously deciding to summon them, they will appear before in a bright light, with all their equipment available to them. The equipment doesn't require maintenance, and any weapons such as guns will have infinite ammo. If the characters require certain things to survive or their power needs a specific thing to use their power to the fullest potential, they will no longer need it.
By default, anyone summoned by you loves you to no end. It doesn't matter what their sexual orientation they have, their personality, or if they are in a relationship with someone in the series they are in, they will see you as their lover. They would gladly sacrifice their life without any hesitation for you, and do anything for you. They also don't mind you having a harem. You can decide how they see you before summoning them, but at the end, they will always be loyal to you and can never even think of harming you.
You have the skills and knowledge to make high-quality figurines of your own, but you must acquire the tools and materials necessary to craft them on your own. The dolls/figurines you make are great enough that they'd be highly sought after if you sold them, and not counting actual magic or schizotech they'd be the best out there.
If a summon were to ever get killed, they will be reduced to a figurine for 24 hours and come back to life after that. But if they are killed in this weakened form, then they are gone for good unless you have a reliable resurrection method on hand.
Yes, you can have sex and have children with them. They don't need to eat or sleep, but they can choose to do so if desired. They don't get sick or age past how they are depicted in the figure you used to summon them.
The beings you summon typically come from dead end timelines that no longer exist, where things went so horribly off course from their source material that they don't even have an afterlife to look forward to anymore.
Celestial Dragon
Essence of the Rule Breaker
By taking this essence, your other essences you have taken, are now under your rules, becoming limitless or finite to what it was originally. A single drop of the rule breaker, changing forever the powers before you.
You gain the ability to break the rules of any essence you have chosen, completely making it your own in everything but name.
The essence that you have chosen must be one of your other chosen essences other than this one.
The change can be no limit, no cooldown, instantly at your best without training, studying or experience. The only thing is that it must follow the essences theme, you cannot suddenly have an essence of shinobi that allows you to summon heroes from fate and fire emblem or similar, but you can become a god-level or beyond shinobi instantly just willing this essence to break shinobis essence rules.
Example are as following: There are no drawbacks. Abilities that are inherently always on can be turned on or off. You have immortal clones, overpowered abilities or generally just breaking reality by existing.
You can also have an essence go from god-level skill to nothing, limiting the possibilities initially but allowing you to naturally progress to what your essence initially was and go beyond if you wish, or just leave yourself with useless powers.
Examples are as follows: There are many drawbacks, you want your power to break you every time you use it until you grow steadily familiar, now you can, add that training montage. Want to be only being capable of controlling an element when you are standing in it and no other possible way of using it otherwise, now that is the rules for your power. Want to have the fear of flying instilled in you when you take a power to fly. Sure why not, no one is going to judge you, much.
Alone this essence does nothing, but with another, you can become beyond what you could be. There is no limit to how powerful or how weak you make your essence. This is the hammer that shatters the stone.
This does not stack with Game Changer or any other essences that affects another. Only this essence and another can be mixed.
You get once chance to change your essence(s), and that is before you drink the others. Once you do drink, all essences cannot be affected again by Rule Breaker.
Essence of the Game Changer
By taking this essence, you can now decide how the powers around you act. For better or worse.
You gain the ability to change the rules of your essences, modifying the pre-set rules to fit an idea, a goal, a mission, but without adding new drawbacks or boons like the rule breaker.
The essence that you have chosen must be one of your other chosen essences that are in the vials. Though not Game Changer.
Your changes must be related to the pre-set essences rules. Eg. Instead of once a day you can do it as many times as you want, or you can become stronger, smarter and faster far quicker than if you had taken an essence without Game Changer. As long as the rules aren't broken but only changed your essence will take effect.
Alone this essence does nothing, but with another, you can become beyond what you could be. This is the chisel, cutting away the unwanted marble to be what you wish it to be.
This does not stack with the Rule Breaker or any other essences that affect another.
You get once chance to change your essence, and that is before you drink the others. Once you do drink, all essences cannot be affected again by Game Changer.
Essence of Plus Ultra
In the darkest of places, the most desperate of times. When all is lost, and there is no hope. This essence will be the one to bring light to even the most hopeless of causes.
By drinking this essence, you gain the knowledge and ability that made All Might, Superman and Captain America the greats of their time. You do not gain their powers, but rather, you will naturally begin to understand how they inspire hope, teamwork and positivity, your mind becoming a weapon that will pierce all evil and bring back even the most broken of people. And thus, know now how to change people for the better.
You have a charisma that is unrivalled, knowing exactly what to say and when to say it. Instil teamwork and cooperation where even the worst of rivals can work together. Your very presence makes people have hope and makes them never give up, even in the most desperate of times against the foes that they know cannot be defeated.
You will find is as easy as breathing to recruit people to your cause, to your ideas as you bring purpose and hope to them wherever you go.
Your presence encourages people to grow past their damaged minds and spirits, even if they are only interacting with you for a moment, making them slowly heal, and even if they try to spiral back into the darkness that you drew them from, their very memory of you will stop them.
With your presence, you will instil awe and fear to all enemies you face, even if they are a galaxy-spanning hive mind of bugs, a cold machine, or anything else inhuman. They will know fear.
Your will is infinite and unbreakable. You can undergo all suffering, all pain, and all difficulty. Even when your body should be in the greatest of damage, undergoing the most terrible of events, and facing the worst of foes, your mind will be untouched and unbroken, allowing you to continue of without even blinking. Additionally, your will allows you to combat any changes that will affect your mind, making your immune to even those that can manipulate your brain through biological manipulation. Your mind is your own and nothing will change it. This also grants the boon to hold onto skills, abilities, powers and whatever else that is inherently you, no one can take what is your own, nor suppress nor act without your consent.
No matter the scenario, no matter the foe, you are infinite in will, you will always continue moving forward. Nothing will break you. Nothing
You can continue on no matter how defeated, how damaged, how broken your body is. Your spirit will continue to move and as long as you are outright dealt a fatal blow, can make the body continue to act.
Additionally, this essence will always fill you with a sense of purpose. While this can be to a hero, it can be something similar like wanting to teach people or to help those less fortunate without a cape at your back like a police officer or nurse. Whatever it is, it acts as a foundation and centre for your sense of self and a wellspring of drive and motivation.
With this purpose, you can use it to ignite the fuel that is your existence and dump all your power, all your stamina, all your magic, everything that makes up you that won't outright kill or maim you if it is used for fuel, into a single moment. This moment becomes an action or an attack that when unleashed can break even the most powerful of foes, even when you are at death's door and you are beginning to weaken, this purpose-filled action will be greater than anything that you could do even at your best.
If you use your purpose initially before your body is nearly broken by the obstacle(s) you are about to face, while you are still strong in body, mind and soul, the action or attack would be greater than ever possible naturally. But afterwards, no matter how you were before using your purpose to fuel your abilities, it will be a miracle if you could stand. No matter what abilities, powers or miracles you have, you will be exhausted and out for a significant amount of time.
This ability will not give you the abilities of a hero, but the mind and soul that is needed to be the greatest. And even if you should fall, your memory will drive the people you meet, the people you inspired and given hope, to be heroes and to do much greatness that is not even though possible.
And yes, should you find yourself satisfied with the state of the existence around you and want to pass on to the afterlife, or generally wish to stop being the immortal super god that you are. Whatever the reason, you can pass all your powers, all your strength, all your essences on to another, everything that wasn't learnt being imprinted onto a single entity chosen by you. How you pass it on, will be up to you to decide, a pat of the back, a magical fruit, having the unfortunate individual eat a strand of your own hair, whatever you think would be necessary.
Once you and you alone decide if your power is to pass on to another and have acted on it, you will begin to slowly weaken in everything but willpower, becoming nothing but a weak shadow of what you were before. Your memories will also stay with you, your brain able to retain the possibly infinite number of experiences you have had. The person who now has your power will also now find that there is an echo of yourself imprinted into their mind, allowing the echo to communicate, with the new holder of your power. This echo will never able to leave that entities' mind until the power passes on or the entity dies. This will also stack, allowing future carriers of your power to communicate with you even when your existence has long been forgotten in the infinite of the omniverse.