Ok. I know. Everyone is going to say Vision is the Martia Manhunter of the Avengers, but he's WAY more the Red Tornado of the Avengers (would be traitor to the team/joins Young Justice/Avengers, falls for a human, gets robot family members, etc).
But think about it...
Both J'onn and Hank were introduced in sci-fi stories instead of as straight superheroes.
Both have had multiple id's.
Both joined their teams as other idenities (Yellowjacket and Bloodwynd)
Both have been members or leaders of almost every incarnation of their teams (JLA, JLI, JL, JLTF vs Avengers, WCAvengers, Avengers Academy, Avengers AI, Mighty Avengers, and the one Avengers cartoon with none of the big name Avengers).
Both have a large array of powers, including:
- Turning invisible/Turning small
- Telepathy/Insect telepathy
- Shapeshifting/Size changing
Both are found members of their team despite other more popular members not being (Spiderman, Green Arrow, etc.).
Both have never had the success of their other finding team members.
Both are family men before the team (Both have deceased wives, and J'onn has a deceased child, while Hank has Nadia).
Both got shafted by their team's major motion pictures (Hank was replaced by Scott, and J'onn by Cyborg).
Anyway, just thought that was interesting. I like finding similarities between Marvel and DC.