3. Black Widow (Yelena Belova)
Yelena Belova is a very complex character. She started off as a way for Russia to combat the other, more popular Black Widow. She had a complicated history that ended in the pages of Secret Avengers, thanks to Mockingbird and a random A.I.M. operative. With all the stuff going in Secret Empire and what’s going on with the more popular Black Widow, Natasha Romanoff, I feel now would be the perfect time for her return. I think she could help or get in the way of Winter Soldier and Hawkeye’s current mission involving Natasha.