Brother Captain Tycho, the tragic and noble figure descending into madness, fighting his shame at his disfigurement and losing his battle with the consuming rage which characterizes his chapter. Sad story, but a great character. Basically Phantom of the Opera meets Hannibal Lector.
I am planning on using him as a 'counts-as' Brother Captain Maetrus, the Mantis Warrior who organized the Elite "Praying Mantidae", an elite fighting cadre dedicated to eradicating the remains of the Astral Claws Chapter. Sadly, while battling a company of the Alpha Legion, he was the one who also discovered the 'battle haze' which is an affliction of the Mantis Warriors flawed gene seed. He descended into the battle madness, never to recover.
Seems like a good fit to me. I do have one question for those of you more familiar with this codex than me: what is the Dead Man's Hand? Is it a power fist? Or does it just give him the digital weapons re-roll to his bolt pistol close combat attack?