Shou has 1mp recovery and eh offensive presence. Light of Dharma and Byakuren piggy-backing is more is a little more useful earlier in the game, I guess. Futo and Kokoro should be... average, but it'll take longer than other characters for their passives to get anywhere, and their raw stats/moves are, well, average.
Tokiko's passives would actually be -more- valuable in the base game, especially her "regen hp/mp when taking damage from under 200 affinity" one, which might make her interesting, but her heal will suck and her offensive stuff is whatever so you'll want a subclass whether she's attacking or supporting. Might actually be interesting, though.
Koishi has sorta meh stats and 1 mp recovery, but unlike Shou she can self-fix the MP recov, and she can get a lot of evasion, and evasion works better in maingame. So, maybe? And lastly, based on my experience with Satori... Mamizou is probably hard to keep alive past one hit, but she can take one, at least.