In the main reality of the Marvel Cinematic Universe, Thor and Loki had a tumultuous upbringing together – not only splitting attention from their parents, but causing each other grief whenever the opportunity arose. As we learn in the latest chapter of the newest Disney+ original, it turns out that this sibling rivalry, this was actually a very good thing for the God of Thunder in terms of shaping his character. Without the presence of his mischief-causing brother, Thor is a bit more foolhardy, and it creates issues that extend far beyond Asgard. And as for Loki, he grows into being both a full-fledged Frost Giant!
