I don’t agree that because an actor is publicly fired from a role that the role then becomes toxic. It’s a fictional character.
But the nature of THIS character and the story in which he/she would be portrayed also allows them to “reinvent” the character while also keeping to the established...
Recasting seems to be the best course, and I’m sure Marvel has already considered who they’d be interested in.
It’s already been established in the MCU, in multiple projects, that different multiversal variants of a person do not need to be tied to one face. So a Kang (or Kangs) that look...