I just put up a website with photos of Disney World characters - I hope it actually loads, since there are still some kinks to fix! The link is in my signature.
I read your tips for finding the characters. The number one tip is to ask a Character Greeter (the castmember assigned to the character). They know the day's schedule, and they have a phone number they can call to get info on a specific character for you.
Characters are usually only in one assigned spot - but if they are outside they may move inside because of heat or rain. Also remember that characters get sick, just like you and me, and that one may get pulled to fill in for another someplace else.