Here's a bizarre idea: assign jobs to different people in the party. Give the party leader the ability to assign other knights jobs, in a text box or something, at any point in time. This could come in handy in boss runs (Roarmulus Twins: assign 1 or 2 party members to "switches" and the others to "attack" or "protection") or Graveyards (assign somebody to "zombies", another person to "phantoms" etc) or other situations.
Speaking of boss runs, am I the only one who has their "favorite party"? I hope not because then I would be weird lol. Anyway, maybe give the friends tab customizable folders and have the ability to add knights to multiple folders, like "Jelly King runs" or "Tier 3" or things like that.
Couldn't you just ... tell people to do that? It's not like they're AI bots where you can assign them a behavior and they'll immediately start acting differently, anyways.