Oh jeez Dragon Ball bois... Most of my ocs aren't really that strong but have gimmicks that would give them an edge. I'm picking Nolan Kairo, Karlos "Carl", and Master Major Bossman.
1. Nolan is technically my strongest (not including AU versions or .) Nolan basically has dollar store ultra instinct himself with his enhanced reaction time, his endurance and regeneration would let him stall the fight out for long enough that the others can make moves. But he's not even winning against any of these three on his own. He can also heal others to keep his team alive.
2. Karlos (Base version or he might actually solo). He doesn't have anything to damage them directly but his gimmick is various time controlling stuff. Including time freeze, time looping, rapid aging, and repeating past successful attacks.
3. MMB "The Boss" has weakened versions of many abilities from my other OCs including some from Nolan and Karlos, one of his main abilities is retreating into a pocket dimension to pop out somewhere else (effectively teleporting), and creating miniature contained black holes.