Someone in the general discussions had a suggestion for other turrets - beast and fiend... They said something about wolver, and for some reason I thought "on a stick".
Anyhow, talking about a fiend turret. We felt a trojan turret would be cooler. With pink shadow lasers, like retrodes... or worse - like roarmulous. Call it a nightmare.
The Fiend Turret is a Trojan turret and will spin around and when it sees a knight, it will smash its sword just like a Trojan. The recovery time and AOE of it will be faster and greater respectively.
The Gremlin Turret will be a normal Gremlin riding on a stationary tower. The Gremlin turns the tower and fires lasers and possibly rockets at knights and heart bullet at his friends. If a knight intercepted a heart bullet, he will either heal one bar or just stops it. After you caused enough damage, the tower turns to rubble and will self-destruct in 3 seconds.
The Beast Turret will be a heavy Chromalisk than can not move but can turn around. It attacks with its very long tongue.
I still believe the best way to implement a 'beast' turret without making it look stupid is some some sort of plant.
As for a fiend one, a crazy coffee-maker machine that thows mugs- to expand the devilites and office references.
i can see a Rook style turret much like a Trojan is to a knight or a bishop even