Well, to me, "crush" means someone with whom you want to have a romantic relationship. At first, I thought there wasn't a character that I felt that way about----THEN, I happened to think of Detective Robert Goren (played by Vincent D'Onofrio - "Law and Order: Criminal Intent"). He's very intelligent, and I like how he (in the first years) acted sorta like "Columbo"----like, he wasn't getting "it", and then BAM!, he proved he was a very deep, thinking man, all along. Plus, he's really tall!!
If "crush" doesn't necessarily mean a romantic attraction----which it doesn't seem to be, going-by previous posts----then I would say: Doctor Ellingham ("Doc Martin") - again, his intelligence is extremely attractive, but I don't think I'd wanna be in a romantic relationship with him because he's definitely an Aspie, and ONE is enough in a relationship, probably. Also, Richard Harris' Dumbledore. I'd like to have him as a grandfather.