If anyone's heard of Etrian Odyssey IV: Legends of the Titan, then good. These are the two main characters in my save, and they're supposedly (fraternal) twin sisters. Kupria, aka Ria, the copper-skinned, blue haired, emotionless nightseeker/assassin and Zyrca, aka Rika, the fair-skinned, blonde, happy-go-lucky fortress/tank with a strong sense of justice.
This was supposed to be 13+ because Kupria's wearing something pretty revealing. Subject to change I guess.