Now here's an experimental one. Two characters that is a single entity. An infamous boss from Mana Khemia, because they spam delayed attacks that rain down on you in absurd amounts. Unless you have Roxis, who can remove those, you're in for a really difficult fight out of nowhere. You have no choice but to finish them off, even though they're victims of some mad scientists. Outside of that one battle, we don't see how they look, there is not even a fanart of them, so I wasn't even sure it would work, as their shapes are unique and barely recognizable as humanoids.

Zweis Mage: ZweisMonde, ZweMa, blonde hair, green hair, long hair, animal ears, black eyes, black sclera, pointy ears, colored skin, green skin, blue skin, monster girl, small breasts, massive hands, claws

Extra: fur cape, staff

Zweis Warrior: ZweisMonde, ZweWa, light brown hair, short hair, black eyes, black sclera, black horns, horns, colored skin, teal skin, monster girl, medium breasts

Extra: brown armor, midriff, cleavage, sword