In the general case, it's not a bad idea to keep Sol or Ky as a sub. They don't take as much time to learn execution and math-up learning wise in comparison to other characters. Again, this is if you really want a sub.
Personally, I don't think I have a sub. If I were to say, though, and if I'm familiar with who I'm playing against, I play Potemkin. I don't mind just blocking or waiting for a way out. Especially if I know how the other person plays, and Pot can hurt/pressure you for it. I see the same for Axl, with particular differences.
To repeat a point made above, put time into the charactes you have fun with. Even if it's only Axl Lawlz.
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[Xrd] Axl Gameplay Discussion
Kojou, at least until I progress to someone else. Mainly for combo-into-oki (214) setup purposes on a punish 2A combo, which allows me proximity guard anti-crossup protection crossup situations if I choose. Heavily stunts her neutral game, though, and relies on me getting a hit or—if I can't confirm early—having 2 bars late in the magic string.