This is all going to be according to how he'll appear in front of you, your character, as opposed to what he actually looks like in real life, etc. For the sake of simplicity!

Name: Endrance
Age: 20
Eyes: Red
Hair: Blue
Height: Tall
Weight: Skinny like a Jpop star rake
Medical Info: Doesn't eat enough, and now that he'll actually be "living" in his character that'll come into play. I don't know if I'd call him malnourished, but he really doesn't eat enough. Aside from that, he's healthy. Pretty much.
Physical Traits: Tall. And very purple. And pretty. He is very, very pretty. And wears roses. And sometimes rose petals trail after him when he walks. I. I dunno.
What's Okay to Mention around Him: ... what you should really be asking her is "Will Endrance pay attention to me if I talk to him about something he is disinterested in?" No, really. talk about whatever you want that's IC for your character to know, etc., and he'll take it very much in stride. He's pretty easygoing, and by that I mean he's awkward enough that he'd probably just blink at you and do his equivalent of "...okaaay?" Which is to say, say what you want. :)
Abilities: Simply put, he's a fairly powerful Blade Brandier, which means he has a sword and he will so cut you with it if he needs to. He is also an Epitaph User, which means he has an Avatar named Macha who he has access to... but I'll type that all up when I'm not braindead. \o/ All you need to know about Macha is she's ginormous and looks like a cat and has a Gigantic Gun underneath her skirts.
Specifically for Physics: ... HAHAHAHAHAHAHA. HAHAHA. I mean. I. Sorry, just the thought of a psychic looking into his head made me. Lose it for a bit there uh so. So basically Endrance's mind is a magical land of faeries and sparkles and by that I mean he is really screwed up. He's been a hikikomori, hidden away in his room, for about four years now -- and is terrified of the outside world. Girls scare him -- he doesn't hate them, but they terrify him. (He's Very Exotic~~ and Pretty IRL, and girls flock to him. He does not appreciate this. :|) So there's that -- and all the psychological screwiness that comes with being a hikikomori. Then there's the part where he has severe dependency issues and is Completely Devoted to Haseo. I cannot stress this enough. Endrance would do anything for Haseo. He'd even try to go outside if Haseo asked it of him. SO what this is all leading up to is Endrance's thought process is mostly: Haseo Haseo Haseo Haseo I will do anything for him please never leave me Haseo Haseo Haseo Haseo mom go away I don't really want food :( Haseo Haseo Haseo. ... I should have waited until tomorrow morning to write this.
Shapeshift/Bodyswap/Attacks: Ask~~ I am entirely chill with all of the above!
Maim/Murder/Death: Again, ask. Endrance has "died" before in-game, and he knows how to save, and it'd all be very chill. Also, he's a good fighter who's ... used to fighting! So whatev.
Cooking: Um no. Definitely not. Endrance doesn't even eat a lot. He hates meat and fish of all types, and... he really undereats. He's not anorexic, he just finds food distasteful. :|

Character: Endrance
Series: .hack//G.U.
Character Age: 20
Canon: The World R2 is an immersive MMORPG that's been experiencing some... problems, which just so happen to result in people falling into comas!!1 and others being infected with a dangerous AI, AIDA, that makes them go crazy. For the first volume of .hack//G.U., Endrance is one of those crazies. Plot happens, and the end result is that Endrance becomes truly and utterly devoted to and obsessed with Haseo, the game's Very Angry!!1 Protagonist... all because Haseo "needs" him. And Endrance will do anything to keep Haseo.

Emails exchanged in-game reveal Endrance's player, Ichinose Kaoru, to be a twenty-year-old hikikomori who lives with his mother and is terrified of the outside world and all it holds -- this terror isn't helped by the fact that IRL he is 6 feet tall, naturally blond, and catnip for fangirls. In the realm of The World, however, Endrance is a famous swordsman and Arena Emperor who is also... catnip for fangirls. He speaks disjointedly, with an overuse of ellipses and questions marks, and rarely forms complete sentences -- but that's mostly due to his utter emotional and social retardation. That doesn't explain the purple prose or his tendency to talk in horrible bad-poetry diction; or his dramatic pausing and posing; or the fact that he always sounds like he's moaning... Additionally, because of his awkwardness, he's brutally honest and tactless... and a bit unaware when it comes to other people's emotions. Regardless of his personality and quirks however, what defines Endrance as a person, in-game and IRL, is Haseo: if Haseo is happy, then Endrance is happy. It's as simple as that, and it's kind of adorable. ... In a psychologically-similar-to-a-stalker sort of way.

Sample Post:

The shortmail I received describes our quest... to console the Grieving Fiancée, whose heart has been trodden upon by the cruel savageries of this life... but the area words are on a server I am unfamiliar with. I will voyage into the unknown for you, Haseo, if you will meet me there... but Γ Frightening Unwed Damsel... this is a new type of area, isn't it? The system administrators felt that the cloudy fields and echoing dungeons were not enough, but to supplement The World with such an ugly setting... There is beauty in the fog floating above the swamp, but the water is fetid and inhospitable, reeks of stagnation...

But Haseo said that this evening we would go questing together, and I must... If this is the place that he would meet with me, I must go... Whatever Haseo asks of me... Then the ugliness of this place and the wretched aroma lingering in the air, a vile scent offensive to all sensibilities, even nauseating... It is nothing, a passing trifle. Even the most vicious beasts of the air and earth and sea could not drive me from this area, not before I have aided Haseo in every way that he needs. To this end will I find the everlasting bride, and speak with her...

Oh, most illustrious lady, the unkind workings of this world are well known by my heart... but you must find the way to transcend what has bound you within your shell of pain and loneliness. Even in the darkest moments, when all is lost and there is nothing to be gained from awakening to greet the morning... a light comes to you and fills your soul to a most exquisite overflowing, turning your inner darkness into a beauty that cannot be vocalized...

I too once thought that I could not go on, that there was no sun in the east left to rise and that the distance, and spaces between us were too... but he came, to show that it is worth going on. That love may touch us one time... but last for a lifetime... And it will never let go until long after we are gone, or not even then... I will never let go, Haseo... from the nearest warp point to the farthest Beast Temple, you are here, in my heart.

And my heart will go on and on...