At the age of 13 {year 2011}, Mint visited his family to strengthen their bonds so they will treat him more intimately and to catch up with each other, he is acting like his aunt and uncle are his parents so Kirito won't be suspicious about him being adopted by them [yet], he lived there himself there for around 6 months and then sent a copy to visit them once every month, around that age he experimented on enhancing the human body in specific areas like powering up, healing and greater reflexes, True Mint told him to use it at the event of the car accident of Asada Shino {Sinon} so her dad wouldn't die but to seal his brain and make it look like a coma so it wouldn't affect the story so much and True Mint will say when to unlock the seal {Around the end of gun gale}, and so Mint did that and because he received a new skill he was determined to perfect it. {this time he called an ambulance about halfway to his original death and comforted Shino, the aura helped, and told her he'll meet with her again sometime}
At the age of 14 {year 2012}, Mint has become number 1 on every leaderboard on most popular games, people say he is a great hacker, others say he is the most exceptional AI-created, there is even a rumor he is a player created by the owners of each game to show that there is someone stronger than others and to save money, but almost no one thinks he is a real player that the owners are irritated with because they can see he is a "hacker" but the hack is too complex and when they requested help from the strongest hacker they can contact he was annihilated also the hacker got a major trauma because his confidence was shattered, it was said the hacker spit blood and trickled blood from all his orifices when he was defeated, until 35% of blood was gone and when the doctors checked the leakage was closed off, the reason may be stress or something, the reason was because he saw a horned devil threatening him to never mess with Mint again. He then perfected control on more of his powers and made a guild of himself, the number of accounts filled the guild number completely, it was known as the Demonic Guild because whenever you meet anyone from the guild that isn't the guild master they would most likely slaughter you without words or useless movement but the top 10 of the guild sometime teabag {Mint thinks it is funny}[When I say top 10 I mean in equipment, unique classes, specialized skills, and oldest accounts]. Because Mint wanted to become stronger he trained himself at erasing certain atoms and parts of cells without really damaging them, for example erasing illnesses, viruses, and most other things...
At the age of 15 {year 2013}, he befriends Shino and comforts her about the death that happened at that time and they catch up...
At the age of 16 {year 2014} he shapeshifted into a 9-year-old version of himself and went to go make some new important friends that True Mint wanted him to meet, the friends were Nochizawa Eiji and Shigemura Yuuna, because Mint learned all sort of stuff about music and gaming and his calming aura they hit it off considerably well.
After the meeting, Mint learned to sing a bit and perfected various musical instruments with them, he especially liked playing on instruments because they reminded him of gaming, mostly because you need to hit the notes at the right time so he was great at using them.
At the age of 18 {year 2016}, when he turned 18 he decided to visit his brother Kazuto and send copies to befriend Shinozaki Rika (Lisbeth) and Yuuki Asuna, when he learned that Kazuto gave up on kendo he acted a bit disappointed but surprised that was because computers, however, he was angrier that his grandfather beat him badly so he defended Kazuto by challenging his grandfather into a kendo match, he flinched when he heard about the challenge because he got beaten already when Mint was younger but nonetheless accepted because he was training too from that time, but as expected he got beaten up easily by Mint, Kazuto and Suguha were amazed at how strong he got and admired him, Suguha still promised grandfather that she would train twice as much for Kazuto like the original.
At the age of 19 {year 2017}, he left a clone and disappeared, the close will stay in the area and help Kazuto with computer knowledge and visit them, sometime Suguha spared with the clone but it does have the strength of an athlete so she still can't win even though its a clone.
After he left he helped make the NerveGear so it won't have the FullDrive non-conformity that ruined Eiji's chances in a fight, it makes an individuals body not responsive when inflicted with fear, and learn how to inflict this state onto other people and if it can activate with different emotions like excitement, pain and maybe even to specific brain waves like to kill or any hostile thoughts focused on Mint and instead of the lag maybe it could suddenly teleport the enemy to prison, maybe pain beyond human comprehension and maybe all the information on that player will be transferred to Mint so he could hunt, blackmail and sabotage. most likely the third option because the aggressive one might be important to the story.
Still 19- he figured all that out fast so he left a clone there like he did previously and maybe he would find something new. so now he is going to school as a transfer student because True Mint told him there will be 2 interesting friends there, he goes to class and every girl that saw him froze on the spot and have a crush while all the guys are gritting their teeth, when he enters the class he spots the 2 expected troubled friends immediately, they are Konno Yuiki and Konno Aiko, they are sick with aids due to being given blood with HIV [the story didn't say when they discovered they were sick with it so I will guess they know right now], he introduced himself as Mint next he chose to sit near both of them, every girl was envious but the calming aura quickly resolved this, for the following week he had rejected countless love confessions and befriended both of them, after that week he surpassed the aids so they will live about 8 more years but it will seem to not have been affected by anything, after that he will leave the clone to help them. {from what? good question, I guess the bullies...}. Oh, and btw he sent a clone to befriend Ayano Keiko (Silica) before all this.
At the age of 20 {year 2018}, he went to his family instead of the copy because Kazuto discovered he was adopted and Mint wanted to comfort him, maybe even teach him tricks in gaming and technology, Mint even brought the newest computer parts to update Kazuto's.
At the age of 21 {year 2019}, at this year he meets a little more often with Shino then the others because he knows what is going to be next.
At the age of 22 {year 2020}, he orders a clone to send a long kendo sword that is rare and effective that will arrive on the day of the robbery. At the day Mint arrives an hour before the robbery and collects the box containing the sword, when he collected it he hears Shino that saw him and they chat, about 10 minutes before the robbery Mint shows her the sword and he straps the scabbard on, Mint says he needs to go to the bathroom like 2 minutes before the event, and now the event plays like it previously did but when they fight over the gun Mint hits the robber with the sword and the shot that was supposed to headshot barely missed the head and the man falls down after Mint pushed him with the sword, when Mint hit the man with the sword the man saw a bone devil striking, and he died of fear {Better ending then Kazuma?}, slowly goes to Shino and hugs her because the closer they are the more effective the aura is, and Mint stayed with her for a week and then got replaced with a clone.
Still 22 and he is giving the finishing touches to the NerveGear, now he has learned to manipulate the world perfectly and he can customize weapons, armor and even what drops he would get from the mobs, like he can get a minigun from the boar, guns don't suppose to exist in Sao but here we have Mint one-shotting the first boss with a sniper...it's pretty damn neat.
[this is copy-pasted from the first chapter from here mostly]
At the age of 23 {year 2021} he entered 4 months before the beta players to test the mechanics of the game, of course, Mint just experimented on balancing issues with his weapons and which one to use, at the end he ended up with 3 combinations: of a great axe, war pick, and scythe which is the strongest form named 'Soul Eater', a rapier, katana, and the Greatsword which is the strongest form named 'Electro Dragon' and last, a dagger, a hammer, a shield and throwing weapon named 'Dementhor', these weapons can transform at will to each form mentioned.
He takes a hit at the first level boss and takes a fourth of a health bar only at level one with 1 stats with no skill with his weapons and the damage multiplies with his stats but he balances it out.
he then makes a weapon skill of 777 combo hits at maximum power that uses his 'Electro dragon' but he acts like the max is 86 and says he can use only 29 because of a limit and each slash doubles in speed, and in strength with the greatsword every 5 slashes then the last, at the 80th strike it is impossible to lock onto the weapon and at 700th strike its cutting the fabric of space and time but in this case the area glitches, the name of the skill is 'Electrobution slashes'.
Another skill he made is of 666 combos AOE with his 'Soul Eater' that puts debuffs upon debuffs included very harmful ones like poison and if lucky then instant death debuff on the victims, with the scythe it has life steal that increases max hp and attack power for Mint and permanently takes the health reduced, the name of the skill is 'Doomsday'
And the last skill with 'Dementhor', the skill is that it flies upwards and sets a domain full of lesser Dementhors that attacks every enemy and blocks any attack on allies, if you concentrate the hammers into the original hammer it forms a gigantic hammer that does unlimited buffs for the allies and does harmless debuffs to enemies like blind or stuns.
It took him 2 months for those things and now he is grinding them up and other skill slots like blacksmith, hiding, martial arts, and so on...