So the MC could be a human while being one with Venom or the MC could be Venom hinself
Venom has the ability to copy abilities and keep them when going to a new host shown when he took Spider-Mans abilities and still had them when he become one with Brock.
So what if you have the MC go from world to world stealing powers to try and become the strongest and eventually end up in the MCU.
World Choices
1. My Hero Academia
2. Jujutsu Kaisen
3. One Piece
4. Dragon Ball
5. MCU
Anyway you get the idea. Eventually he goes to DCU and MCU and becomes the strongest being in the universe.
It would also be cool if you kept Venoms personality if he will be his own character when one with the MC.
Idk if its possible for Venom to even do this but it would be a fun fanfic