1. Strong, has tons of immunities, and has a lot of hax, isn't the strongest tho since his build isn't speced for combat

2. Strong, but only about planet to star level

3. Strong, but only about planet to star level, has anger empowerment like the hulk thanks to her ultimate skill and has infinite energy

4. Very strong, knows almost all magics and their counters

5. Very strong, knows a lot of magic, has extremely strong luck hax

6. Strong, but mostly relies on seduction and mind magic, which most of the other people have immunities to

The biggest problem with this is ainz and milim,

1. ainz because his immunities are tied to tier magic, while none of them use tier magic, the same with the physical combat system, they also grant complete immunity to a lot of things, which idk if they could bypass, he also has an absolute death skill which can kill anything in his verse, which we don't know how it would effect other verse's beings

2. milim because it's a natural rule of her verse that nothing but another ultimate skill user could harm a user of a ultimate skill, but none of them have skills.

I give my vote to Doctor Strange if you meant every version of him. his magic is versatile and more powerful than the other though John has strong hax.

Constantine and Strange no doubt