You've got to be kidding. I hate his guts... Jellal irritates me no end because Erza so often just mentally disintegrates into a dithering tween crybaby when he's around. As it stands now, he seems OK, but I just know that the show's going to do something awful and stupid with him that will totally ruin his character and others. Even then, he's tiresomely one-note, brooding and whining all the time. He's never happy, but there's no gravitas to his misery either so he just comes off like an insincere idiot who's pulling an act to get laid. Still, for what it's worth, he has gotten better as a character and the author (so far) seems to have taken the high road with regards to his relationship with Erza.
You might have guessed from this that my favorite character is Erza. She reminds me a lot of Riza Hawkeye from Fullmetal Alchemist: Brotherhood, and the fact that she's voiced by the same woman certainly helps, I love that voice. I like that she's mature but has this sort of caricatured warrior's attitude and fashion sense that make for a fairly funny yet likeable character. She's not stuck-up but she's definitely powerful and calculating in a fight. Erza often seems like an adult to the other three, but she has her own shortcomings which make her dependent on her teammates and the guild. She seems like a reasonably complex character with a cool ability and a nice personality.
That, and she might just be the most attractive character I've seen in anything ever...