I am never sure who counts as an obscure character, obviously Mickey, Donald, Goofy, etc don't.

Looking at names listed on here we did meet Kermit and Miss Piggy at MGM studios back in 1998. We have a pictue of us with them and my sister (who was 4 at the time) looks scared of, or at least suspicious about Kermit. We also met Meg and Phil from Hercules that year, though then again Hercules was quite new then so they could have been regulars.

In 2004 we did see Friar Tuck from Robin Hood....does he count?