Tom Lucitor

Tom Lucitor is a side member of the Starco Avengers. He is the stand-in for Loki in the EBA Edited Universe.

In the EBAEU
Tom is first introduced in the War for Starco. He is with Adam McArthur and Ben Fotino when Daron Nefcy attacks their transport to take the Dimensional Scissors from them. It appears that Tom is ready to hand over the Infinity Stone, but he remarks that they have Ben, cuing the green giant to attack Daron while Tom tackles Adam to safety.

This is the last we see of Tom, but based on Loki's fate in Infinity War, odds are unlikely that he survived the attack.

In SvtFoE
In the show Star vs the Forces of Evil, Tom is the prince of the Underworld and one of the central characters to the plot. He and Star dated in the time before the show began and they began dating again in season 3. He originally hated and wanted to kill Marco, seeing him as threat to his relationship with Star, but the two have since become strong friends.

You can learn more about Tom on his SvtFoE Wiki page.