I can only remember the confrontation scene in Matsuribayashi, when Mion introduces the members to Okonogi. I think she says something about Rena's "adorable"/"I want to take it home" mode while Mion does not call herself a title because she's the one who's speaking, and (even for Mion) it would be too arrogant to give herself a title of honor. Rena is also related to as the "silent blue flame" while Keiichi is the "bright red flame". That's all I can remember as far as club titles are concerned.
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