Doctor Strange
Doctor Strange has already proved himself to be a useful character, especially when it concerns with Marvel’s multiverse.The Sorcerer Supreme will definitely be needed especially since Thanos is after his Eye of Agamotto which is also the Mind stone.
Black Panther
Like Doctor Strange, Black Panther also has a history of being involved in mysticism. It also helps that the heroes home country Wakanda produce the most powerful metal in all of the Marvel-Viranium. That will come in handy when dealing with a powerful and mad king who is trying to destroy the universe.
