Preliminary thoughts:
If Fia is being honest, which... I think might be the case for a couple of reasons, I'm not suspicious of her. Can't 100% write her off, but not immediately looking at her, I think? I'm also not suspicious of Cure as a result of this--and also given what has happened to Cure in general.
I'm also not suspicious of Duck and Tiki. I believe I know both of their quirks. This does not guarantee that they are not mafia, however, by itself. More of a general impression on top of the nature of their quirks. That said, technically their quirks could go either way. Not going to look at them right now.
I'm waiting for 1-2 people to comment on last night before proceeding, though. Without Gerry or Rasei in the equation, that leaves Katagi, drandahl, Ace, Aeiou, and arguably Tetsuya as the ones I plan to focus on this phase. Tetsuya is the lowest on suspicion of those few.