20Not The First Time Loki Hasn't Been Himself
When you think about his role as the God of Mischief, it makes sense that Loki likes to change things up a bit.
If all you know of the character Loki is Tom Hiddleston's performance int he Marvel Cinematic Universe, you don't know the character quite as well as you think you do. Loki has been around in the comics a long time since his debut in Journey into Mystery # 85, written by Stan
Lee and Larry Lieber with pencils by Jack Kirby in 1962. Since that time, he has changed form more than a dozen times including a period recently when he took over the body of Lady Sif or the time he became a snake. He even turned into a unicorn at one point.
In most cases where Loki changed his appearance, it is all part of a complex plan to accomplish some sinister goal. That's certainly the case when it comes to Kid Loki. In other cases, he changes form for entirely altruistic reasons or through the machinations of other beings. He became a unicorn in Loki: Agent of Asgard #8 when the heroes and villains switched sides. As a being of pure good, he demonstrated the ability to turn himself into a being of the purest form: a unicorn.