OneOne.

ONE (stylized in all caps) or Tomohiro is the pseudonym of a Japanese manga artist, who is best known for his web manga series One-Punch Man, which was later remade into a digital manga illustrated by Yusuke Murata. One serializes the One-Punch Man webcomic on his own website under no official publisher, while the manga remake is serialized in the web version of Weekly Young Jump. His other well-known series, Mob Psycho 100, was serialized in the online version of Weekly Shōnen Sunday, Ura Sunday.