President Loki is a variant from the Asgardian god Loki who deviated from his predetermined path in the Sacred Timeline. Why he got captured by the TVA and how he created a nexus event is unknown, but it was bad enough to get pruned and see his timeline destroyed. All that is known is that he became president in his alternate timeline and kept on acting like one when he ended up at the Void. There, he acquired a whole army of Loki Variants with the goal to overthrow another variant, Kid Loki, and become King of the Void. Obviously, everyone in his army had another plan, all being variants of the God of Mischief, and President Loki got betrayed by his own army.