Ok here's my veredict on it.
Flavour wise the role makes sense. The flavour part of of the named Quints' abilities that Apollo gave later make sense. This checks.
You can see thar Apollo claimed 4 abilities in the Masons' part and later added Yotsuba which is the Inno ability. Now I was going to wait for Apollo to answer but the way he phrased it here I believe he would say it's Yotsuba. This part is WIFOM but I'll say it regardless -> Rej's favourite Quint is Yotsuba so I can see him making the "main" player ocuppy Yotsuba's slot.
Now as for abilities. First ones that make the most sense. Studying session I see no problems with it, borrows a quint ability when the slot doesn't have anyone. Similarly for the grouping ability.
Putting aside Yotsuba/inno ability the 4 Quint's ability are ok. Don't see any issue with those.
Now the Outfit's and Yotsuba's ability. This is where my issue is. If I take it at face value I could say that this is a cult role and it's a given that Apollo has an inno ability. Plus the outfit ability could be used to switch the alignment of a culted player with Apollo and make the culted player appear inno to inv. So if this was a Town role what purpose would it serve?
Right now and if Town (and I'm open to suggestions) it could be to make the role look scummy. I'm not saying that it's Town or cult and I won't try to convince anyone otherwise of either but just for everyone's info
Mitch's role in the Greek Mythology game had an untrackable passive and he was Town. There are more examples but you know where I'm getting at. I could cite one more example but I'll refrain from doing so and from my POV I could see this being the case considering one ability I have (and no, I'm not going to say what it is and it has nothing to do with inv)
Could be cult? Possible. Could be Town? Possible. Would it be worth it to leave Apollo be for now and check if a convert/cult WU appears? I'll leave it to your judgement.
One thing to take note. Let's say that he's indeed cult. Would it make sense for cult to only be able to get more members if Mafia is dead? Quite the handicap I think and it would highly depend on Town's performance which I think it would be quote unfair for a cult.
On another note. Let's say the role is indeed Town. The masoning ability is heavily restricted to not let be many confirmed Town at once. Still kinda powerful but only if the role makes it to endgame.
Tagging for everyone to see