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Makes me wonder how long his mom was changing diapers for. The poor lady. =[

Haha! Yeah, most people don't think about that. I know I always think of reasons or that sort of thing much later on, but it's pretty important.

It could be that he was a baby for a long time. I pity his parents if this is the case.

It could also be that he grew either really quickly, or just as normal, for a while, and then his aging just... slowed down immensely. Or stopped altogether, though I hope that isn't the case, because that'd mean that his parents look (most likely) to be the same age he does.... and how awkward would it be to introduce some seemingly seventeen-year-olds as your parents when you don't look any younger?

Yo, Giyari here. I'm not on my computer, can't be bothered turning it on just now xD
Right lets get going then

Age, maybe think about bumping that up quite a bit. The average age that a human male reaches the height of his physical perfection and health is around 30, the prime time in human males. Okay, so he isn't human, but it makes sense that he would age to the prime age then the immortality kicks in. Either that or you make him actually like 200 and that would bump up his apparent age too.

His appearance is not much of problem, there are LOADS of different people in the world, he could dress in pink pokadot with a yellow bowler hat and it wouldn't make all that much of a difference. But you've described him well, he comes across as a pretty normal looking guy, Tall with dark features and a pale complexion. As for build, wirey is a better way to describe it.

To me the personality works fine. Some people say that angsty characters are immediately mary-sue's, but that's not qwhat makes a character a mary-sue. If you can roleplay an angsty character well, have him more than just a walking pile pf loathing and self hatred then it's all good. The 'faking happiness' part isn't needed though, it also contradicts the rest of his personality. If he's quite withdrawn over all, then he probably wouldn't need to fake happiness, example. Someone he has let get close hurts him, being withdrawn he would more likely just cut his ties with them and ignore them blatantly. if someone he hasn't let get close, it wouldn't bother him anyway.

Talents, No accent is fine, he could have moved around quite a lot in his younger days.
Talented singer is fine too, that's perfectly normal, it's possible for anyone to be a singer.
Powers? Wayyyy too many, firstly the 100% bloodline, how did it come around? His mother was a singer yes? Would it be plausible for a fullblood vampire to be in the public spotlight? In fact, would it even be plausible for a fullblood vampire to even have a job? From my point of view fullblood vampires are the equivalent to nobles and royalty no, so would she not have more of a 'leading' role in the vampire community? Secondly, all the elemental manipulation. I would just chuck them all tbh, they're too overused in my opinion, and if he'sa full blood vampire then there a high possibility that he wouldn't need them to be devastatingly powerful anyway. The mind control thing seems a little useless too. there really isn't much need for it, if he's a fullblood then his stature and political power should be enough to keep lower vampires in control. It would also eliminate the question as to what vampires he could control, all, just partbloods, partbloods and weaker fullbloods? What is a weaker fullblood? What I'm getting at is you just don't know who's a full blood, partblood until you try it, and if you can't control them then you're probably too late and they've ripped your throat out...

Mentally slower? So he's stuck for a long time as a stroppy teeneger? XD