Honestly, Lantz I would like some more clarification on Angra's abilities. I also think it would be the respectable thing for the other players as well.
Alright, a rundown -
Doomrider - Right on the sheet. Not much expansion needed beyond that. He just really loves cocaine.
Lawrence - A little more expansion on the sheet. Sin Eaters are capable of performing ceremonies related to the dead, such as sealing away spirits, entering the Underworld, showing others what they see, and some other nifty tricks. They're also capable of spending plasm to heal themselves, or as a stop gap measure to seal wounds and simply ignore horrific damage to their own bodies.
The death rejuvination thing takes 24 hours, during which time, they'll wake up at either dawn at dusk, covered in a caul, experiencing the death of someone who died in a way similar to their threshold through said caul. It's by no means a pleasant thing. A few other sin eater abilities is being able to see the exact age of someone, and how close they are to death - its instinctive. They're also able to see and communicate with ghosts, and if their Geist permits, shift their perception into the Twilight itself. They can also see if someone is possessed by a spirit or ghost.
The Keys are capable of activating for each manifestation - currently Lawrence has the Caul, Rage, Boneyard, and Curse manifestations. The Industrial caul allows him while active, to retrieve or use things implanted inside his body. For example, with the caul active, he could shove a shotgun into his arm, and have it become a part of his body. When it deactivates, it's still in there, but not visible or usable to anyone. It's part of the twilight. The Stigmata Boneyard allows Lawrence to manipulate, ward against, and attack the very essence of ghosts and spiritual entities without needing to lift a finger while active, though he enters a trance like state during its use, oblivious to the outside world besides the Boneyard. The Industrial Curse causes machines to practically disintegrate at a touch, or catastrophically and maliciously malfunction, though the direct damage is usually what happens. The Stigmata Rage causes disorientation and woozyness.
He can only activate one manifestation with one key at a time - he can't use both keys at once.
Hopefully this clears things up a bit. His profile was getting long as it was so I needed to cut some stuff out of it so it wouldn't go into a freaking book on this shit.
Juan - What you see is what you get. The only addition I could really make is that Going Loud attracts the direct attention of the God Machine - its not something he'll likely do more than once, if at all in this RP.
Jack: He needs vitae to live - the life force within blood. He can also flip out and go berserk for more power, surrendering fully to his vampiric nature, but the beast that results is mindless. This is called Frenzy, and can also happen due to hunger, fire, or just plain anger.