I've always considered myself an Eeyore, sometimes a Rabbit because I tend to be a realist as well, but Eeyore has always been the character that called out to me because I'm most of the time a pessimist. I always look to the dark side when it comes to the unruly situations I somehow put myself into, therefore minimizing the hit of the worst case scenario when it comes.
BUT... I do notice that when I'm around fellow Eeyores, I automatically turn into a Tigger. And of course it's not to change anybody's mind about anything shitty we're in: I simply don't like the gloom brought on by too many Eeyores being in a 5-feet radius. Too many little grey rain clouds can cause an intertropical convergence zone.
To me, this says I can't box myself or anyone else as an optimist or a pessimist... or maybe even a realist or a dreamer, because as people of free will and free mind, we tend to adjust to the types of personalities that surround us at the moment. In fact, I couldn't imagine living the life of the eternal Eeyore. I'd probably drown under my own rain cloud if I did that. On the other hand, if I were with someone who's perpetually the Tigger, I'd likely wring his/her neck the first chance I get.
It's good to know that we're not all just one type of personality, that we have the innate ability to adjust when faced with certain individuals or certain situations. Question now is, do you prefer you being the Eeyore or being the Tigger?
I still love being Eeyore... and being Rabbit. I'm just forced to be Tigger sometimes.