Not to keen on your making Usagi an alcoholic but at least I've found some on who remembers Usagi Yojimbo (he was always my fav character in from the turtles although he was only in 2 or 3 episodes).
I remember this dude! He cameoed on the OLD Ninja Turtles series back in the 80s! i know he's got his own comic series (which i would LOVE to read someday!) and if i recall a spoiler, a son who's traveling with him and does know that Usagi's his dad! w00t! Nice take on mr.-ears-in-a-topknot! I bet this IS what he'd look like if he ever lost his shit!