Spoilers Character Between Dr.Strange and Sym Spidey in State of BR.

Fabwizi

It seems to me Spiderman ending with Venom left behind and Strange being connected, It is going to be a character from Multiverse of Madness.

Possibly Venomized evil Dr. Strange or Venomized Spiderman of some kind but definitely someone that left behind venom attaches too, and from the multiverse if madness movie.

Who's that Pokémon?

Unknown

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Chobbly

Going from the Symbiote Spider-Man: Alien Reality comic series a while ago, it could be Red Cat (Natasha Romanoff) or Hobgoblin. Both interacted significantly with both Symbiote Spider-Man and Dr Strange.

Hoitado

Nvm