I Defeated Thanos, and You're Still Putting on an Act?

Leon transmigrates to the Marvel Universe and becomes Peggy Carter's adopted son. On the eve of war, Leon awakens a System and vows to become the most powerful big shot around! The Chitauri survivors who fled in a panic tell Thanos, “He's a demon!” Iron Man points at the vibranium armor, magic armor, and other gear before him and says, “He grew up with me. He's my best friend! He helped me make all of these!” Nick Fury says, “He's even more terrifying than Hydra. He destroyed S.H.I.E.L.D.!” Mephisto looks at the hell he can no longer enter and cries, “Even God never treated me like this!” The Ancient One says, “He's a VIP of my boss, Vishanti!” To Leon, all of this is just trivial stuff. Having lived two lives, all he wants is to see the scenery beyond the multiverse!