These are ideas that I love to to see between two characters and I would think you guys love the see too.
Popeye vs Bill cipher:
They both are very powerful as Bill cipher has reality warping and Popeye has toon force. It would be a very crazy fight with Bill fighting against a toon,which are very powerful forces that not even gods can easily defeat.Dr nefarious vs Darcy:
They are both evil mad scientist/conquerors(i guess nefarious does want to rule the universe and Darcy has a hive mind of amphibia greatest minds)with an army of robots and has some weapons on their side, while Darcy just has melee weapons and dr nefarious has laser weapons but they could be able to fight in face to face.Doom slayer vs all fnaf animatronics:
This one is just for fun and seeing how fnaf gotten more weird and with the animatronics gotten more deadly, so someone like doom slayer can destroy those guys,especially William afton.Ridley vs Violator:
Well this one is because I couldn't think of what other characters that Ridley can fight against,so I just thought about the Violator which is a spawn villain aka a demon going against a space pirate monster.Death(have a nice death) vs collecter(owl house):
Two powerful beings, one is a star child and maybe a demigod,the other one is death himself with an army of soul stealing sorrows. With the collector being an annoying little child;let's just hope that death doesn't lose his temper and...kill him in a blind rage.Kraang(rise) vs asura:
You must be wondering why I pick this match-up?well 2 reasons: 1.i may or may not want to see kraang get his wrecked and get taken down by anyone just because they just wanted him to make it look like no one can't stop this wannabe God and his ass definitely need to be taken down like a bitch and the way how Kratos kill off poseidon!!!-but that's just my reason. 2.it would be a really awesome fight between these powerful characters where their fights would be insane as they smash eachother in between buildings,mountains and etc. Just think how awesome if asura keep taking all of those blows from kraang and they one shot eachother in the most ridiculous and epic ways,tell me that no one doesn't want to see that.