"The MCU has introduced many new characters after Avengers: Endgame, and I'm happy that Thunderbolts* director Jake Schreier's latest comments suggest Marvel is embracing its best new hero. Thunderbolts* is a collection of many of the MCU's best antiheroes, several of whom were introduced in Phase 4. A few MCU veterans are returning, such as Bucky Barnes and Ghost, and many newer faces are also joining the fight, including Yelena Belova, Red Guardian, U.S. Agent, and Taskmaster."
https://screenrant.com/thunderbolts-marvel-best-post-endgame-character-mcu-director/
