Hey, author here :)
Someone asked me to make a chapter explaining Mc's power set, so this is what I'm doing. Do bear in mind that this is my understanding of the powers and not stuff copied from the wiki, so stuff can be wrong.
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1-Free.
Free is a character from the anime/manga Soul Eater, and he is the base of my Mc. Free is a werewolf from the immortal clan and is (duh) immortal, he wields ice magic and not much is known about his past other then he stealing the witch queen's magic eye and transplanting it on himself.
Of course, there is more to the character then just this, but this short explanation is enought to understand my Mc, if you want to know more about the character then go see Soul Eater.
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2-Eternal Mangekyo Sharingan.
The sharingan is a special eye from the anime/manga Naruto, it allows the user a few abilities: 1st Super perception and reaction time, making the world apear in ultra HD and slow motion. 2nd Fotographic memory that is also linked to muscle memory, it pretty much allows the user to mimic other's movements (like fighting style, penmanship, even powers if the users body can phisicaly handle them) at a glance. 3rd The eye is also known to be hipnotic and has the ability to cast illusions throught eye contact and be imune to ilusions themselves.
The mangekio sharingan is an evolved form of the sharingan, on top of boosting the base abilities to a degree, each eye gains an unique power (for my Mc, I choose an ice power to reflect original Free's magic), if the user has both eyes as the sharingan (not my Mc's case), they also gain the ability to summon a Susanoo. The drawback to the mangekyo sharingan is that using it's unique abilityes causes persistent damage to the eye and will cause blindness if overused, the eternal mangekyo sharingan is an even more evolved form of the eye that does not suffer from the mangekyo's drawback and boosts the basic abilityes by yet another degree.
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3-Observation Haki
Observation Haki is an ability from the anime/manga One Piece, and works like a 6th sence that allows the user to sence their surroundings with incredible precision, it can even percieve people through walls. This 6th sence is so powerfull, it can give pseudo precognition at lower levels and the ability to truly see a few seconds into the future at higher levels.