About the portrait on save file thing, it was Rumia for maingame, Nitori for Plus-Disk, and turned into Kaguya around 27/30F grinding.
Parallaxal:Self-buffs are less useful when I've got Iku and Yukari out almost all the time to keep everyone's stats in tip-top shape :V Plus Reimu popping in whenever needed.
Also, about Reisen's defenses, yeah, they get around what Keine's are; that is, what unbuffed Keine's are :x That Reisen can keep her stats at 80~100% buffed DOES help a lot, though. Plus since Winner almost exclusively has elemental magic for MND-hitting attacks, giving Reisen two Physical Reactors would help a crapload.
Being able to pray for PAR off Shiki helped in her favor. But I might end up using -both-, really. Between Maribel, Reisen, and Shikieiki, plus Renko at like the start of the battle to get the debuffs rolling... yeah. His lowered offensive stats and speed would really help out the stayoutibility of those three, plus if I manage to score a hit of PAR from Shikieiki, BOOM there goes 1/4th of his HP at LEAST.
If I get ultra lucky and a rarely-used Galaxy Stop hits PAR then I instantly win :]