Megu: dumb as rocks but a genuinely good person. She only does "bad" things at Kasumi's command, and only because from her perspective Kasumi is batting 1000 with everything she says. More members? More hotsprings? Escapes and getting through crazy ordeals? The President is always right. Hot spring love.

Kasumi: Megu is an amazing person whose smile must be protected at all costs. Nothing else matters, but blowing shit up is fun and that's cool. Doesn't actually care about "hot springs", but is passionate about whatever Megu is passionate about (is surprised in the latest event when Megu echoes this sentiment to her, saying she likes what the President likes). Wears a mask so tightly it deceives herself sometimes; does not want anyone to know what she truly cares about--Megu included.

Ichika: Officially tsundere toward the hot spring club. They're very annoying but it's not a black and white thing.
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I really want to know what Kasumi's deal is, Gehenna flashback arc when?