Name: What's the color connection? All RWBY names are required to have a color connection.
Appearance: Please spell and grammar check more. There are WAY too many errors here (if English is you're second language, I can excuse it to some degree, but the point still stands). And while I'm on the subject, make sure to put a period at the end of sentences. Adding spaces between paragraphs would also make this a lot easier to read.
Personality: This is really bare-bones. I hope this is just suppose to be the framework for the character, cause the very little that is there is something I've seen a LOT. Especially from beginners.
Skills: Soooo.... stealth, basically? Ya probably wanna elaborate on this more. Most sections of a character bio shouldn't be something that can be summarized in a single word. People are complex, therefore explaining a person is complex.
Aura/Semblance: Not a bad starting concept, but what are the drawbacks? Approximately how much aura does using his semblance take? Are certain materials harder to phase through than others? What limits are there to when he can use this semblance? Does he have to concentrate to do this? How does he avoid phasing through the ground? What happens if he runs out of aura while phasing through something? Does he get spit back out? Can he make objects phase with him? How does his semblance tie in with his personality? Phyra had polarity because she was drawn to people that same way metal is drawn to a magnet. Ruby has speed because she's very excitable and kinda hyper. Ren can mask emotions, making others seem as calm as he usually is by default. Don't just pick a power cause it sounds cool and call it a semblance. Hyper analyse that $#!t.
History: First of all. Grammar! Please! And periods at the end of sentences! That alone will help a ton. Second of all, there is a TON of stuff missing from this. How did he unlock his semblance at an early age? How early of an age are we talking? What was his relationship like with his parents before they died? Why did he want to be a huntsman? Was it because he looked up to his parents in some way, or was it an external cause? You said he "never trained to be a huntsman", but then immediately after say his parents taught him the fighting skills he'd need. That's a contradiction. Either he trained or he didn't. If he wanted to be a huntsman, why doesn't his history section make any mention of him taking steps towards that goal? How did he survive the fall of Beacon when his parents, trained huntsmen, didn't? Didn't any rescue parties search his house for survivors afterwards and take him to an orphanage? Why is he living in an abandoned mansion? How did he even GET to this abandoned mansion? If he wants to let someone get close to him, why won't he let anyone get close to him? How does he take care of himself when he lives alone and presumably has no source of income? Is he just scrounging for food? How old even is this kid?! Finally, I'd like to point out that the "someone-important-to-them-died-and-they-blame-themself-and-now-they-shut-everyone-out" story line, has been done to death, to the point it's more of a trope than a story line. Mix things up a bit. Did his parents die protecting him? If so, would that sacrifice make him all the more determined to become a huntsman so he can carry on his parents legacy?
Likes: People...... yet he avoids them. Fancy food..... which he wouldn't be able to try since, as previously mentioned, he's presumably broke.... and avoiding any people that can make said fancy food.
Dislikes: Unless your character is working with Salem, I think it goes without saying that they'd dislike the thing that does nothing but kill, maim and destroy. 'Grimm' was not a necessary addition to this section. Also, why would he dislike daytime? I can understand being tired in the daytime (I'm naturally nocturnal myself), but what reason does he have to dislike it?
.....You realize the show staff actively avoid looking at fan-made stuff 99.9% of the time, right (the other 0.1% being the time they had a competition for Velvet's combat outfit)? Even putting that aside, first of all, if team RWBY and the gang are in a town, why wouldn't they just stay at the local inn? If the town is big enough to have a mansion nearby, abandoned or otherwise, then surely it's got some kind of inn-like service. And why would team RWBY want to let another person in on the MASSIVE secret of the relics? Especially when it's someone they just met, barely know, and have little to no reason to trust?
TL;DR: This character needs a LOOOOOOOT of work. Also, grammar and spell checking, PLEASE.