Has Boothill showed up in more stories than any other character?

It occurred to me learning >!that he has an upcoming role in the Fate side story.!<

It makes sense given how popular he is, regardless of his ownership being extremely low. He's extremely entertaining and free to roam anywhere as a Galaxy Ranger. The writers don't really need to justify him showing up haha.

Of course we're ignoring any main character like Trailblazer or March for this question to make any sense.

I hope I'm not forgetting anyone when asking but when I ran through the cast in my head I couldn't think of anyone who's shown up in more events.