Okay, so people I have that are likely to have watched UFC/followed it in some capacity...more than like the occasional fight, but more as regular viewers include!!!:
Frankie, Lina, Etienne, William, Ezra and Rana.
Rana, being active in martial arts, though typically only one kind, would be well into talking to him/fighting with him. His gym teaches eskrima and also eskrima for MMA. Only problem with Rana is he's not comfortable with the jits aspect and any other groundwork because of his wings, but eh! Lina is also pretty skilled in Muay Thai, though she does have the advantage of being stupidly strong to make up for any lack of finesse/skill, so she finds it a little hard to fight fairly.
Ezra and Etienne are the least likely to want to throw down, though Tien actually wouldn't mind getting his ass kicked by a legit UFC fighter. His mates would all be hella impressed.
Anyone else he may want to meet I would be happy to literally randomly throw them at him, though some would be less friendly/impressed than others. Cadence is about the only one who would have actively followed the news about him, though Rana probably did at least a little.