THe charachter bus stops ion epcot a few times a day... I always see it in the WS... There are a bunch of chacters on it - last time we say it - it stopped in Japan - and on it was Mickey, Minnie, Donald, Pluto, Max, Goofy (I think), Terk, and a few other characers... it is great fun to see the bus b/c when it stops you know there will be a lot of characters to meet.
(Not sure about times though -- maybe someone else knows?)