Rohan Kishibe

Rohan Kishibe is a fictional character introduced in Part IV: Diamond is Unbreakable. He is featured as one of the main characters and is the only character of the series to star in other standalone stories. Being a successful cartoonist by profession, it is likely that he's a self-insert of Hirohiko Araki. The name Rohan Kishibe appears to be an anagram of the author Araki Hirohiko. Rohan's name shares enough letters to spell "ARKI HIHO", and duplicating the missing letters in "O,R,A,I,K" would complete "Araki Hirohiko."