It's probably the story of a shut-in who used to be sickly but is now incredibly strong, beating up NPCs and other players who come to challenge him in various worlds.
By the way, I hate tragedies!
So I'll just have to take in all those tragic girls myself...
Completed worlds: Aria the Scarlet Ammo, The Elder Scrolls, Katanagatari, Dynasty Warriors, The King of Fighters: A New Beginning, The Holy Grail War, The Labyrinth City of Orario, A Certain Magical Index, Gensokyo, Dungeon Fighter Online, RWBY
(New book: My Dota Can't Possibly Be This Cute)