Well, Eyeore makes appearances across from the Pooh’s Toughtful Shop in the Pooh’s playground Fantasyland in the Magic Kingdom. Along with Pooh, Tigger and Piglet. But honestly it’s mostly just Pooh and Tigger. So what you can do is go up to any WDW cast member on cashiering and ask them where the certain character you want is, and they can call and figure it out for you! :]
Really simple, and really quick!