I've had many crushes on fictional characters over the years, some of them weren't crushes as most would think but I realize now were actually me wanting to BE those characters.
Early movie/tv crushes;
Robin Hood from the Disney animated movie. He was awesome. He was Robin Hood! What more can you want?
Peter Pan from the Disney animated movie. I wanted Peter Pan to come and get me and make me a lost boy and I wanted to fight pirates and go on grand adventures and bother mermaids.
Michelangelo and Donatello from TMNT. I wanted to be their friend SO BAD. I always felt a connection to Mikey because he's such a clutzy goofball compared to his brother. Donny was everything I ever wanted to be, smart and sweetnatured and still badass. Also, he had a stick. Gotta love the bo staff.
Dr. Alan Grant from Jurassic Park. That smile! HNG. Also, he was awesome. And he dug up dinosaurs and threatened children with raptor claws, what's not to love?
Rufio from HOOK! Cocky bad boys are a weakness. I wanted to live with him and fight pirates and be in general totally awesome.
Mamo-chan from Sailor Moon. He was so cool and he had a top hat. TOP HAT. Also, a cane. Who can fight against that?
Haruka and Michiru from Sailor Moon. I know I had crushes on other ladies but Haruka and Michiru made me so happy, at the time I also thought I was leaning towards girls and I wanted to be Haruka and be this really butch lady and have a soft sweet wonderfully girly girlfriend...
Book Crushes were a little more odd because I read so many books so fast I don't remember them anymore... I don't remember who I loved and who I didn't love.
My current book crushes are a little easier;
Sam Vimes, from Discworld series by Terry Pratchett. Sam is more than a crush, he's an inspiration.
Cheery Littlebottom, from Discworld series by Terry Pratchett. Cheery is an awesome little lady. With a beard.
I also have random character crushes on characters who are meet and discarded in two paragraphs by Mercedes Lackey like Steelmind the Hawkbrother in Owlsight.
Oh! I've also got crushes on Harry Potter characters. >>; Don't judge me.
I sometimes develop crushes on other people's characters that I roleplay with. Like, if I'm RPing with you and I start gushing joyously over your character than I've not only gone off the deepend but I adore your character so much they are making me blush and wriggle around like an idiot.