>>717857509
He's a 100% sincere Gary Stu OC who's the strongest, nicest and most sexually attractive guy in the underground, who has all the most desirable traits like being a kitsune boss monster, and has only "flaws" are external stuff that serves to make him more likeable like having a dead little brother that makes him want to protect everyone more. He's so powerful that he literally has to go into hiding because Undyne challenges him to a rematch every single day and gets her ass kicked, and he can beat Masked Ceroba without taking more than a few HP of damage (the author included the healthbars to make it clear that he no-sold the fight)

4chan turned him into Mr. Satan, He's a keyboard warrior who makes photoshops of himself with other characters and tries to pass it off as real online, and he does train martial arts but he's terrible at it and has no proper form. The only person in the world that believes in his abilities is his little brother, and he lives with his mother who placates him. Not a bad person outright, just narcissistic and willing to delude himself and others.