Densetsu no Yuusha no Densetsu, Tate no Yuusha no Nariagari Recommendations
They are both about an underdog with awe-inspiring power that is hard to control. They both have a secondary character that remains with the main character even when being pushed away. They have similar settings.
These animes had similar vibes. The settings are both fantasy, and the protagonist pretends not to care but also helps others, especially those he cares about. Both have a sort of "corruption" ability which brings them to attack their friends, and both are manipulated by the nobility although it is in very different ways. Both shows are quite enjoyable and if you liked one, you will probably like the other ^^