I'm a big Joe fixit fan
Kitty & IBom are the obvious choices here. But don't ignore Longshot, he is a great mystic champ. I much prefer him to Ebony Maw or Diablo.
I have iBom and Kitty at r4 myself. No regrets there. I can vouch for both of them. Granted, mine are both awakened, but I don't think it matters too much. They get better with but aren't slouches by any means without their sig abilities. Piggy was in consideration alongside iBom when it came to my first rank-up. He's a good offensive champion that's also quite valuable on defense. If I were to tier my suggestions, he'd be in the second tier below iBom and Kitty.I've heard good things about Joe Fixit but I don't have him myself. Longshot has a tendency to nuke down a lot of my cosmic defenders in BG, but I don't have him either. This would be the third tier, although that's mostly due to me not having any experience. I simply can't vouch for them being in any higher tier.Domino would be in the highest tier if she was awakened, at least if you play BG. She's a goddess in there. I wouldn't rank her up unawakened but man, when you dupe her, have your resources ready to go.