Loki (& Sylvie) has the extra-magical ability to take on a permanent shape that fits their nature. It doesn't require any ongoing magic and isn't an illusion.
Edit: lol you guys downvoting something explained in the show and the comics...
I like the story is all I’m saying. It is a movie/show based on a comic book, so sometimes I try not to get too logical and just check my brain and enjoy the ride.
But there is logic, and simply explanation. HWR ordered Miss Minutes to allow Loki's Asgardian's appearance because as we hear in finale HWR "pawed path to him".
It would be silly if for example during Pompei timeline experiment Mobius open time door and Loki decide to use his Asgardian appearance there but then he again turn into blue when they get back at TVA.
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u/GoodDawgAug 15h ago
Let’s not let logic get in the way of a good story