Okay. Arguably not the greatest, but I'd definitely take him over some others.Because the thread calls for "greatest."
Usagi is really great.As in the Greatest Wizards thread I am late to the party and all the people I'd list are already listed. Although I would like to give a second mention to Usagi Yojimbo.
I notice a few people have listed actual gods. Me? I would hesitate to add anyone who is fully divine, like Thor or Rama. It's just not fair to the likes of mere mortals. Even semi-divine ones like Gilgamesh and Achilles can't really compete.