Actually, everyone's in the roster except Takuma and Ito Rei. I updated it recently. I'm not adding them until the end of Day 6 - Day 5 is sort of their trial period (no offense new guys, but the names you see in grays in the roster are people whom skipped out on us - before adding you I want to make sure you'll actually stay).
I'm starting to be close to adding Mizuho and Tom's name in grays - indicative of me taking them out of the plot at the end of Mission 1. I expected infrequency out of Mizuho's character due to Sen's track record (no offense meant), but she's missing some of the best parts in which she could contribute. This is a vicious circle of "I haven't been around for awhile" "What's going on?" "I feel like a hair on soup" "Maybe I should try posting" rinse, repeat. I can't imagine it's all that fun for Sen to post for Mizuho whenever she comes around becuase she has so much to catch up to and that it might feel awkward for her to try to be included in again.
As for Tom, his presence was rather infrequent after the holidays. I understand him getting a life and having computer troubles -- but Tom is starting to feel like a ghost on the Miharu and he could very well start facing a similar predictament as what I described with Sen. That can't be very pleasant... but I don't have too much choice but to start considering Tom's removal from the plot since Yukari depends so very much on his character.
Sadly, it's easier to explain his absence than to explain his inactivity and I seriously have to focus on the characters whom are around.
If both of them start showing up more and actively contributing, I certainly have no problems having them around!
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Kokuten, your avatar is, ah... interesting.