Not Roxy to me (50/50), but Mal0, Isabel, Nicole and Salazzle have always been anti-furry for me so far.
Diane and Lycanroc always have been furry in my playthrough however. Probably because of their events?
Roxy is random, so is Nicole and Salazzle.
Guaranteed Anti-Furries so far, from what I know, are Mal0, and Isabelle. They are 100% AF.
Guarantees Furries are: Lycanroc, Dianne, Luna(?) And Amy.
The rest are random: Nicole, Salazzle, Neko, Roxy, Krystal, Ralsei, Rena, Judy, Lola.
Hope I'm correct, I haven't played this game for a while.