While I wouldn't call it a "crush" per-se, I am rather taken with Octavia. She has the most beautiful mane of any pony I've seen, plus a fetching body color. But it's not just outer beauty, she's cultured and a musician to boot.
'Course that eye twitching kinda creeps you out, but hey, nopony's perfect.
Now, for my real fictional crush, we have to go back a few decades and down to Fraggle Rock, where I met Mokey. The kindest, sweetest creature I ever saw. She's smart, brave, creative, sensitive and never has an unkind word for anyone. I really could've used someone like that in my life back then. Hell, I wish I had someone like that now. But, yeah, I can honestly say I crushed on her big time.
The last tic-crush was with Judy Hopps (Zootopia). Not only is she cute as a button, but she's fearless and smart. Someone I'd love to hang out with.