Taiji

Okay, the Taoists are still pretty cool, but they're Asians, so it's okay. All the others you listed are just mediocre, and the Kalevrites are downright weak.

They used to have double damage against most opponents and an excellent skill tree, but now they have one of the best origin bonuses. Succubi also had double damage against most opponents, but they took half the damage themselves. Add to that their immunity to melee weapons. The Nosferati had double turns in two out of four battles, which was very cool. In Lapistia, they generally had a lot of advantages. Only in this game can they not be called overpowered. And there's no need to even talk about the Nihons.