Going by your listings...

White MageEither Minwu, Rosa or Aerith. All three have interesting roles within their game stories and they all have some fun mechanical quirks as well with Minwu being a "taste of power" feel to him, Rosa was an exceptional White Mage with good offensive ability and Haste, while Aerith honestly has my favorite set of Limit Breaks in VII. Overall, I'm going to give this to Rosa though because I feel most of the White Mages who have come after her pretty much live in her shadow somewhat.


Black MageI would protest that Terra really belongs in Red Mage since she does learn healing magic. But the obvious choice you missed was Vivi from FFIX. Not only one of my fave characters from the game but honestly one of the best Black Mage builds in the series that doesn't give you serious customization options like VIII and X. Focus is a gamebreaker skill, doublecast as his Trance ability makes him the top damage dealer, and his Sword Magic dual techs with Steiner gives him more reasons to be a permanent party member on my teams.

Blue MageSmallest pool unfortunately and with the exception of Kimarhi, I like all of them. I generally prefer the class in titles with job class systems as they always have issues in games with other customization systems to attend to. Of the actual characters though, I might give this to Quina who was always a fun source of absurd humor and one of the strongest Blue Mages of the four in terms of real versatility to their abilities. Quina hearkens to the spirit of the class established in FFV by being a gamebreaker if you knew how to use them properly.

Red MageFor a class that is widely popular in the franchise, it's actually interesting to see that the class has never had a proper character be them outside of XI and the Dimensions franchise. Outside of the actual class itself only Celes actually hits all of the traits of the class with Rydia and Tellah being more of a Sage build since both of them are subpar fighters. Regardless, I feel Celes wins this anyway.