Peyton Reed praises Jonathan Majors' performance and explains how the two of them crafted Kang the Conqueror for Ant-Man and the Wasp: Quantumania. Although Majors first appeared in the MCU in Loki as He Who Remains, Ant-Man and the Wasp: Quatumania will be his first true appearance as Kang the Conqueror. Kang is a different type of MCU villain, and with his time-traveling ability and connection to the multiverse, he will be the biggest threat that Ant-Man has faced, even after helping the Avengers defeat Thanos in Avengers: Endgame.
https://screenrant.com/ant-man-3-director-praises-jonathan-majors-kang/