Okay I'm trying to think of things mechanically and here's where I'm at.
From N2 interactions, we can assume that one of Celever/DLE/Drookez is a Strongman. DLE is a neigbourizer and I doubt they have both this ability and a strongman. That said, DLE could theoretically be scum Neighbourizer. I don't know. No idea how flavour would even work those two together. If anyone here spec'd Bigvivor then lmk.
We know that Clouds could double post N3. This means that Drookez motivator claim on N2 holds. If Drookez really is a JOAT, even a mafia JOAT with 1S*-Strongman, then they shouldn't be able to use both on one night.
Given that Celever has (to my knowledge) idled N1, 2, & 3 and was supposedly blocked N4, we have 0 confirmation that this claim is true. Given this with the above reasoning, Celever is mechanically likely to be a strongman. Even nights if I had to guess.