Skaven
Plaguemonk Censer Bearers: come in trios. Must start twirling their censors before slowly slamming them into you. Think mailers, but more numerous but weaker
Slave Slingers: like Ungor archers, more numerous, but give em like…limited ammo, between 2-7 depending on difficulty. Then become regular melee enemies.
Jezzails are likely impossible to adapt into fun enemies with the way this game is designed. But they’d make interesting stage gimmicks for levels built around them. Like make a level based around fighting through a location while a far off Jezzailnis trying to snipe you down with unlockable high damage shots. Only way to survive is to hide behind walls and pillars.
Rotbloods Chaos Tribes
Warhounds: fast low profile units. Will partially disable players by biting their legs, preventing movement and dodges, but players can still block, attack, push etc. so they can free themselves.
Forsaken: small chance that a Chaos Warrior mutates into a Forsaken after taking significant HP damage. Forsaken fight like armoured berserkers. However mutated body parts are unarmored.
Beastmen
Razorgor: MONSTER. Fast moving but noticeably more fragile monster. Vulnerable at the sides. Bucks around.
Tuskgor: same as warhounds above, but tankier and slower
Brayshaman #1: casts Flock of Doom. Sends swarm of crows to do minor damage to players while obstructing view and prevent ranged weapons. Player and allies can kill crowd with melee attacks.
Brayshaman #2 casts Bestial Surge on one fellow Beastmen at a time, granting them the Bestigor’s charge ability
Harpies: flying specials that grabs and lifts a player. Can be attacked by grabbed player to release them
Lord: Beastlord on a Razorgor Chariot: Charges around a large arena. The Razorgor and Beastlord would have separate health pools, and whichever dies first will trigger a second stage in the fight where the surviving Beastlord or mount gains a new moveset.