Solar Slasher

I've FINALLY reached 20,000 Feathers again, and I have quite the predicament. Who to promote to 5*?! I currently have... Nino (+Spd, -Res) Reinhardt (+Res, -Spd) Camus (Grand Hero) Clarisse (Grand Hero) Nino is merged, and I know that won't transfer, but she's a main team member with the ideal nature. Reinhardt and Camus are great common Red Unit counters, and Clarisse has amazing debuff action with her personal weapon! Help, please!