scout: demon soldier: cyberdemon pyro: cacodemon demoman: spider mastermind or revenant. heavy: mancubus. I mean, who else but that big badass? engineer: pain elemental medic: archvile sniper: imp ( i know revenant's rockets are kinda like a sniper rifle, but I have noticed that imps can see players, even from VERY far away. I even tried an imp out on one end of DIS and me on the other.) spy: spectre
SENTRY GUN: a chaingun powered by a machine, and the chaingun has 2 chainguns at level 2, level 3 has a rocket launcher out of the back of the machine DISPENSER: a weird portal like machine that has a pentagram acting like a sort of hologram type thing, level 2 the pentagram has a soulsphere face in the center, level 3 it has a megasphere face and the pentagram spins rapidly.
TELEPORTER: basic doom teleporter, exept with pipes and mechanical feet or holders going into the ground, level 2 has a glowing eye, level 3 has a pentagram and green fire like baron of hell's fireballs flying around it.
SMALL: health bonus bottle.
PAYLOAD CARTS: a rocket launcher rocket skin.
CLOSETS: DOOM style doors
SMALL: ammo clip
MEDIUM: ammo clip and shotgun shells
LARGE: Ammo clip, shotgun shells, Rocket boxes, and energy cells.