Board Thread:Questions and Answers/@comment-4441317-20161207154019/@comment-61022-20161208202929

Yeah to clarify on the speedster angle, JLA/Avengers Vol 1 is a great resource covering the incompatibilities between universes. Two in particular that were focused on quite a bit was the Speed Force and magic.

The Flash couldn't run in the Marvel Universe as the Speed Force doesn't exist there. In order to run in that universe he needed a device that collected and stored Speed Force in the DCU that he then used on in the MarvelU. It was finite and eventually ran out.

Alternatively, magic in the DCU is much more chaotic and much wilder than magic in the MarvelU. When Scarlet Witch tried to tap into the Chaos Magic of the DCU it was incredibly difficult for her to control.

Likewise, the Infinity Gauntlet couldn't be used in the DCU because it was from another universe. (Marvel has since explained that even in the multiverse the Infinity Gems from one universe are powerless in another)

That said.... here are some of my picks:

Strength Factor: Outside of the Hulk there are only Hulk-related characters that could really size up against Doomsday. So either the Red Hulk or Skaar. Any gamma spawned character whose strength level is enhanced in some way based on their emotional state. Outside of that there's not really anyone who could match Doomsday because of his ability to come back immune to the previous power level.

Speed Factor: Makkari of the Eternals is the only speedster in the Marvel Universe that has speed comparable to the Flash. (Yeah, Quicksilver and Speed, while fast, are nowhere in the same league as anyone who uses the Speed Force)

Animal Factor: There is nobody in the Marvel Universe that I can think of that has powers exactly like Animal Man. But someone with comparable abilities (in terms of adaptation) would be Darwin, since his mutant powers allow him to adapt to his environment, his physical form and abilities are varied depending on his evolutionary needs in much the same way Animal Man pulls the traits he needs from the animals around him.

Energy Factor: There are not many characters who can transmute matter and energy like Firestorm that would greatly overpower him. Technically, every Eternal can mimic Firestorm's powers but to a much greater degree. I'd say that Captain Universe would be a better fit. The Enigma Force that gives Captain Universe his powers could be argued to be stronger than Firestorm's powers -- however -- whoever has the Enigma Force utilizes those powers to varying degrees and skill bases. Someone with little understanding of science wielding the Enigma Force and becoming Captain Universe would likely be a good fit.

Elemental Factor: Going to have to agree with ADour on that one since there's really so few options. It's either going to be Storm or Thor.

Tech Factor: Lots of options here, I think the best fit would be Machine Man. The two both have similar adaptive technology that can be reconfigured at will.