Yuuy: A complete lack of canon to go off of. There isn't even a TRC equivalent that you can extrapolate off of (I mean, not really anything significant beyond the like. two things we know). Kero: His voice Sakura: Keeping her interesting and preventing her from being generic and boring to interact with. Fuuma: Getting him to interact with people who aren't Kamui. Yumi: Keeping her interesting and preventing her from being generic. And having her develop past her issues without forgetting what her canon point is. Kurogane: OH GOD. EVERYTHING. HE IS SO HARD TO PLAY. OTL Himawari: Keeping her interesting and preventing her from being generic sparkly girl. Also, having her grow past her issues and difficulties without it seeming unrealistic, but not clinging to those issues, either, simply because they're her canon personality. Hokuto: Not making her obnoxious. But keeping her fun and spunky and over-the-top. She is incredibly exhausting.