Hmm, I think all characters are cute in their own ways, they all have something that makes them have a specific fanbase. However on the other hand, I have many that I admire the most of many series though I can not recall them all right now, but I will list those I do think are adorable ((Hmm crushes eh? ;) )):
Naruto: Kakashi, Iruka, Zabuza, Orochimaru
Wolf's Rain: Tsume, Darcia, Zari ((in an awkward way))
.Hack//Sign: Bear, Balmung
Macross Plus: Gold Goa Bowman
Akira: Tetsuo, Kai
Ghost in the Shell SAC: Togusa, Batou, Saito, Pazu
Gundam Seed: Yzak
Trigun: Both Vash and Nicholas, just cause they're hilarious.
Inuyasha: Koga, Ginta, Hikaku, Sesshomaru, Renkotsu, Naraku
Yup and the list goes on, but I could spend all day just writing it out. So I'll leave you with that. :)