What units should I focus on for missions? For red dps I'm thinking Mutsuki - Yuuka - Hina - Aru w/ Hifumi and Serina
For yellow dps Momoi - Tsubaki - Iroha - Nonomi w/ Hanako and Kotama

Tsubaki's weak to yellow though so I might need to swap her out, but dps is so high that it doesn't matter.
PVP I'm stuck around 2000 so I probably just need to mix and match units and colors more