Nobody's talking about it even though it seems pretty significant

Our character seems to have a signed photo in his/hers room. Who could it be?

My first thought was Ryuki but it looks like we meet him for the first time during USUM so not him.
Maksed Royal? Possible but i doubt they would want to make the protagonists as big fans of wrestling
Kahili? She's a successful golfer but for some reason i doubt we'd have her signed photo of a golfer since its not something a lot of young people are into
New character related to the photo club? Possible but it seems like photo club is more about selfies rather than about being famous.

Outside of Alola
Diantha? Thats probably the safest bet: she is a famous actress and a champion so that would make a lot of sense. The background seems like orange-reddish, reminds me of Laverre city.
Brycen, possible but unlikely. Elesa? Doubt that. Anyone else?