Noah. High 7-A character that has the composite of the entire verses concept hax at a multiversal level... and every character in the verse has concept stuff. She has good regen and is a robot, so many methods of taking her down don't work. Additionally, as she is the incarnation of the multiverses concepts, if you BFR her or erase her too well, you basically nuke yourself at a conceptual level. A fair match against her just has too many variables to meet.
Mamoru. He has passive supernatural luck that changes the past, but aside from that is a normal human. If he doesn't passively defeat his opponent, he probably gets stomped.
Satou Hiroshi. He is a perfectly average human. That alone makes him lose against virtually everyone that is allowed to have a profile on the wiki. Almost all characters he can really fight are featless 10-B keys of characters before they got their actual powers... and then the match either is immediately decided by the opponent being above/below average... or it doesn't have a conclusion since there are no real feats.
Well, at least the fight against Hitler was fun.