Osiris/Atum/Eros/Raphael/Ryu-Oh/Amaterasu/Marduk
...pretty much anyone who has team buffs/team heals/orb eat/ally BG raise and no elemental buffs/debuffs since they'd be useless to an off element team, which is why I didn't list Michael despite how good she is.
but damage is super trash, so they're literally only good for their abilities, even if you have Diabolos Unleashed... which you'd need 3 off element girls for anyway.
Rainbow grids r dumb
well, unless you just started the game I suppose.