10 Worst Things Loki Has Ever Done To Thor
10. He Killed Kid Loki
One of Loki's few moments of heroism was when he sacrificed himself to stop the Sentry from killing the Avengers. One of his most evil moments though was when he sacrificed himself again.
A less noble reason for Loki's sacrifice was that it allowed him to enact a plan to be reincarnated with no knowledge of his past evil deeds (a.k.a. the rest of this list). It worked and he was reborn as the innocent Kid Loki, a completely new person.
However, that wasn't the end of his plan. Loki's old personality survived as the raven Ikol. Ikol then manipulated Loki into helping Thor return from the the afterlife (he had died fighting the Midgard Serpent). Kid Loki succeeded, but in the process bound his life to an artefact that would one day allow Mephisto to conquer the universe.
This was all part of the old Loki's plan and he revealed that the only way for Kid Loki to destroy the artefact was to allow him to take back his body. Kid Loki agreed and was completely wiped out, replaced by his older evil self.
Thor had loved Kid Loki and seen him as a chance to finally have the kind of relationship with his brother he had always wanted. When he found out what had happened, he was heartbroken.