Two Retardedly OP Quirk users (MHA x OCs)

Will 2 boys be able to rid the world of evil.
One with a demon/dragon quirk.
And the other with a level quirk.
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This is my first fanfic, and the first story I wrote for a while, I am going to apologize beforehand that I can make a lot of spelling mistakes. so if you see some plz let me know, it will help me out.
If there are things that could be done or have been done in the story or ideas for it, I will appreciate your feedback.