I will also add that it's not that Loki went into a new timeline at the end. The timeline was altered by Sylvie killing this version of Kang and thus causing a multiverse war. This version was making sure all his other variant versions of him didn't get out of hand, Sylvie has put everything back to square one.
nolan palmer
2021-09-13 06:21:16 +0000 UTC
He who remains is basically a variant of a comic book villain named Kang The Conqueror. The character will appear again in Ant-Man 3 and is rumored to be the MCU's next big villain like Thanos.