Oh, from your answer earlier I thought you already chose them. :V
Since there's no need for portraits for the partners you can go wild with them.
For A i had either
- Chiyuri: She had the angled lasers in PoDD, motivation is that Yumemi scanned a power source in the underground and sent her to go along with Mima.
- or Kurumi: She'd go well with the weirdly angled shots as well, don't have a proper motivation for her yet.
but I'd say that Chiyuri is the better choice.
B could be
- PC-98 Alice: She already used doll formations in MS stage 3 or elements in the ex stage, so that's flexible. Why would she go? Same reason as current Alice, really. And she wants to annoy Mima for beating her up back then. :V
(- 5 Magic stones: lel)
I honestly am not really pleased with my choices for B
and for C I have
- Marisa: Missiles are obvious and she already used the Oreo's Orrerie's suns as a shield. Motivation is obvious as well. Mima goes, Marisa tags along wanted or not.
- Yumeko: Exploding swords, why not. The shield is explained via her distorting space (It's a fan theorie that she can do that, which is based on the distortions she causes to the background and her phasing out of combat and it goes nicely with Sakuya's time manipulation). Why does she go with Mima? Shinki sends her out on a journey to learn of the ways of the world. (I'll come up with something :V)
- or Rika. Tanks, Missiles whatever goes. She's an engineer like Nitori, so a shield is no problem for her as well. Motivation? She can create ghosts but now there's something weird with the evil spirits and she's worried. Or she is interested in what's causing the geysers to erupt and if it can be used as a source of energy for advanced machinery tanks. More tanks.
Oh, and while I'm at it: For IN I had thought of Yuuka as a partner.
Mima is the fast unfocused one, Yuuka is focus mode.