Whether it be on his own as the God of Thunder, one of Earth's Mightiest Heroes, or the All-Father of Asgard, Thor Odinson has always been synonymous with the grandest adventures the Marvel Universe has to offer. Along the way, Thor's titles have changed almost as frequently as his appearance. By contrast, the core of who he is has rarely strayed from where it began. Of course, that hasn't kept the kind of struggles he faces from growing even more dire over time. By embracing the days he thought were long gone, Thor has just proven that even battling against the darkness itself doesn't have to be grim or gritty.
Source：https://www.cbr.com/marvel-thor-classic-costume-return-meaning/
