Mephisto! The Master of Malice, Devourer of Souls.
If you think Loki is the only Mischievous Scamp there, then you have not met the Real Prince of Deceivers, Spirit of Universal Lies The Mephisto. If Marvel takes his role seriously, he would be the next fan-favorite character in the MCU, just like Loki. In the comics, Mephisto is pretty much the Marvel version…