A zombie with the Quad-Shotgun from Legacy of Suffering. Can fire each barrel individually for a weaker, longer-ranged attack, or can rarely fire a powerful blast from all four simultaneously. Has to reload after all four barrels are fired. Needs careful placement so it's not overpowered.

An arachnotron variant with a railgun. Can be used at longer ranges more effectively than the standard Arachnotron, but a slower attack makes it more vulnerable at close ranges.

Similar to the ordinary Former Human, the Rapid-Fire Trooper doesn't stop firing. A little more dangerous than the standard, but still easy to kill.

A dangerous zombie with an interesting weapon. After a wind-up period, the Repater Zombie rapidly fires a slightly-explosive hitscan attack. If it fires for long enough, the weapon overheats and spins back down. Dangerous when allowed to keep firing, but very vulnerable until it does.

A higher-difficulty variant of the Lost Soul. Has a weak projectile attack, and tries to kamikaze when low on health. Weak, individually, but can be very powerful if the player doesn't know how to deal with them.

A lesser monster with a few interesting gimmicks. Firstly, it ambiently heals itself very rapidly; and secondly, it runs away when low on health. These combined make a surprisingly durable monster. Aside from that, it throws a pair of very fast projectiles.

A zombie with a bazooka. Can potentially kill a player in one shot, but could also kill itself and other monsters instead. Requires very careful placement to be really effective.

A rocket zombie with an alternate sprite set. Some numerical differences, but otherwise the same as the other rocket zombie. Mostly depends on what sprite set you want.

A simple, light, melee-only, undead dog. Not very powerful and can't take much damage, but can leap at the player to get closer.

A slow, melee only demon with a lot of health. Has to be carefully placed in the map to be really dangerous.

More of a joke monster, the Segway Zombie attempts to run the player over, doing low damage that adds up over time.

A stealth-based monster about as strong as the imp. Once it starts firing, it doesn't stop until it loses sight of its target. Used well in dark areas, but don't make it unfair on the player.

A zombie intended for very long range. Fires a single, decently-damaging, very-fast FastProjectile. Would be more fair at longer ranges than the Zombie Railgunner, because its attack has travel time.

Like the Zombie Railgunner, with two main differences; first, its railgun is weak, but rapid fire. Secondly, it has a chance to charge up its railgun (while walking around) for a more powerful blast. After it starts charging, it can't attack for a while, but can hold the charge until it shoots.

An imp-difficulty monster with aggressively-homing fireballs, but has a long animation before firing. They make decent snipers.

Much like the Soul Harvester in difficulty and attacks. However, when killed, it releases a ghost that fades after a short time, but can sacrifice itself to resurrect another dead monster.