What is it's name?
Rogue/Thief
What is it's story?
Uhh, he believes great treasure can be plundered from creepy/abandoned places?
What does it look like? (feel free to post sprites/images)
Corvus from Heretic? Maybe edited to weild a dagger.
How does it play? (physics, abilities)
Stealth based gameplay. Weak body, however agile. Should be rendered translucent if the thief is going slowly enough (or stands still) (done via the velx/vely/momx/momy expressions in decorate?)
What are it's weapons?
Dagger(s). Primary attack is melee(quick slashes, stabs), secondary attack throws a dagger? (The daggers could be poisoned, so any hit enemies will suffer further damage over time)
(optionally) Blackjack. Stuns enemies for a short while on hit. (might also deal some minor damage)
Why does it belong on GVH?
Because the human team has no stealth based class, while the ghouls already have one.
Thats it, basically. I could extend it with any information or tell how i imagined the features to work. (as I'm a modder myself)