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I think I finally have personalities for Joshua and Sierra settled.
Sierra, the Red Oni, is very much into battling, and because of such is very hotheaded. She likes to travel, and hates how there are so many restrictions put on traveling (like beating the gyms in order to use moves like Fly or Surf, that sort of thing). Finally, she loves her team and wouldn't give them away for anything. Except maybe the Vileplume, she found that it just didn't work out as well.
Joshua, the Blue Oni, is the opposite of Sierra. He's mostly quiet, a tad timid, and really not into battling or traveling as much. However, bring up the subject of breeding, or bring out a Pokemon that seems to have been loved and raised very well, and Joshua will become a breeding otaku, rambling on about the beauty of breeding or the beauty of a Pokemon and all that jazz. Kind of like a cross between Ruby and Gold from the manga.
Oh, and for Genderbent!Gameverse!Red...
Red, the female version of the Red we all know and love, is just like the male Red we all know and love. Hardly says anything (and even when she does, it's limited to a sentence or two), and even has a similar team. She's also very powerful, like the male Red we all know and love.