Anime with an OP MC who hides their powers

A collection of anime with overpowered main characters who hide how overpowered they are at first.

For anime with multiple seasons, only the first season is included in this list.

Similar to this list:
Anime with an OP MC or OP-Tactician MC - here
Isekai Anime with OP MC - here
Anime with an OP MC who hides their powers - here
Anime with "Seemingly Weak But Actually OP" MC - here