Oh shit, do I really have to explain? Nah, I'll do it anyways :D
Jonghyun. Kim Jonghyun/김종현 also known as Bling Bling Jonghyun. Why, is he my ultimate kpop bias? Oh man. So many reasons. Firstly, he has an uber bucket full of talent. And his voice, is so amazing, yeah? Powerful and passionate. Damn, he's got himself a good set of lungs (Y). His voice is so soothing, TO ME. I can't fall asleep without hearing his voice :3 Anyway, second, his personality is just fucking unexplainable. He's probably secretly romantic attention whore, but he's so caring for his hyungs (as seen in Hello Baby, which you can watch the first episode, part one here). And I find it lovely that he loves to joke around (especially with Key) ^^
Moving on to the third reason; He's a fucking sexy puppy eyed raptor okay okay? Haha, fine, maybe it's not a reason but I think so. ♥