He will probably be a support frame, plus he is supposed to be highly accurate so...
Passive: While standing still 33rd gains an armor bonus for each allies within range and increased accuracy for all weapons.
Unveil: 33rd flashes a symbol that marks the guilty within range, marked enemies will take increased damage.
Herald: 33rd begins chanting and reduces recoil and increases fire rate for all allies within range.
Absolution: 33rd kneels down and becomes stationary (armor bonus of passive activates), during this time nearby allies gain heavy health regen and minor energy regen. Status effects are also cleared once every 5 seconds.
Forfeit: 33rd sacrifices all armor to give all nearby allies a divine shield (think an aoe iron skin) OR 33rd makes a blood tribute losing 50% of current HP to fully restore all allies HP and 25% Energy, 33 gains full shields and minor HP regen for X seconds.
Also from his concept art and the introduction of the 1 handed pistol + 1 handed sword stance, id like to think he will use that incense burning mace and pistol at the same time, I can see him being able to charge up the mace like a glaive and throw out the incense pot to create a small aoe gas cloud that puts enemies to sleep.