The Psyker was leaning against the wall popping his finger knuckles in a strange manner, using the thumb on the same hand to do so. Of course, the others on the team didn't know who he was, and he intended to keep it that way, at until their mission started. His powers were subtle enough that it wouldn't be obvious, and others tended to be very... Distrustful, of his kind. Not completely unfounded of course, a single slip and he could end up exploding into demons, even dooming an entire planet to destruction. He was sanctioned, of course, but it didn't hurt to be careful.
He was a fairly normal looking person, no outstanding characteristics. Straight medium length black, average appearance, green eyes. He wore an Imperial Guardsman's uniform, with his only other worldly possessions a whip that had been made obsolete, a chainsword that had seen genuine combat only once, a laspistol he had never used, a cloak to keep him warm in the cold, and his psionic focus, a rune carved in the symbol of his world's saint. Others might mistake him as a Guardsman, and they were not entirely incorrect, as that's where he was supposed to have been headed before the events that ended in his arrival here.
He heard the nerd ask for names, and decided to answer with simplicity.
"Eizen."
If he wanted to know more, he should ask.