MCU: 10 Characters Who Will Definitely Survive Phase 3
2. Scarlet Witch
Introduced as a villain in Avengers: Age of Ultron (after a mid-credits scene in The Winter Soldier), she made the switch to the good guys later in that movie, and was a fully-fledged (and very powerful) hero in Captain America: Civil War. That'll continue for the rest of Phase 3, as she's confirmed for Infinity War and, almost certainly, Avengers 4.
Why She'll Survive
Scarlet Witch has already developed into one of the most powerful and interesting characters in the MCU - thanks in no small part to Elizabeth Olsen - and that should continue into Phase 4. There's too much of an arc ahead of her to kill her off now.
The Russos have said they want to explore the romantic relationship between Scarlet Witch and Vision, which we should see in at least one of the next Avengers movies, and possibly both. However, due to the Infinity Stone in his head, Vision seems like he has to die, and that opens up very exciting storytelling possibilities for Scarlet Witch. They can't go full House of M, but they could adapt elements of it, and that breakdown should be a major part of Phase 4.