A rare time where I am qualified to speak as Brest season ticket supporter, albeit only been to 2 games of his this season because of covid, I've watched all their games. I just replied in the transfer tweets thread but may as well post it here too.
Seems to be some talk he's a winger, but he's a number 10. He is capable of operating in a wide position and has certainly taken up positions for Brest there this season, but he's typically starting at number 10 or another sort of advanced midfield role. Brest have quite a fluid attacking game though so you would see him move around a lot. In the transfer tweets thread, someone mentioned that he looked like a budget Grealish and I have to say that's an apt comparison in terms of style.
I wouldn't get your hopes up too much for this as while I rate him quite highly, he's not quite good enough for us at least at the moment. I struggle to see where he'd get games. He would have been an upgrade last season on the likes of Lingard or Pereira as a backup to Fernandes, but not now with the amount of options we have. He'd get lost in the squad. Having said that, I rate him a lot and he's definitely one of 3/4 Brest players that are probably good enough for the Premier League. I'd rate him as the second most impressive Brest player this season. However I don't think he's be any higher than an upper midfield team in the league currently, however you never know if he keeps improving. If Villa were to sell the likes of Grealish I could see Faivre doing well there. Or at the likes of Southampton or Leicester. I see PSG are linked too, and I think he's definitely do well for them as bench option, certainly in Ligue 1.
However as others pointed out, he just joined in the summer. On top of that he signed a new contract over christmas since his star was so positive, so I really don't see him leaving until the summer at the earliest. Selfishly, I hope he doesn't quite leave that soon but he certainly will outgrow Brest. For the money they paid, they got a great deal. Not sure how much they hypothetically would want for Faivre, but they got 15 million out of Southampton just this summer for Diallo who was a lesser (albeit different player) to Fairve so I would expect it would be in excess of that tbh. Unless there some finacial problems that I'm unaware of.