Fire Demon

Combat
Useful to change the terrain for a lava based team... is what the Gallery says, but that's outdated. Fire Demons are now all rounders without any terrain changing skills.

Note that they have Pheromones onAttack and Burn onSeduce. If you're not careful, that enemy you're looking to recruit might turn to a crisp first.

Playing Against
Due to FlameStrike being a fixed skill, try to spread out your units when engaging the Fire Demon. Also keep in mind, that FlameStrike has a high mana cost. As such, the Fire Demon will often only be able to cast the spell once per fight.

Overworld
There is a forest tile event involving Fire Demons and Futa Potions. If you have a Fire Demon in your party, you get an additional option to acquire the potion without a fight.