If you liked
Campione! Matsurowanu Kamigami to Kamigoroshi no Maou
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...then you might like
Seiken Tsukai no World Break
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There's quite a lot of similar elements, but the main one is each certain group or country having one extremely OP dude out of a small number in the world, which includes the Protagonist being the OP guy for Japan, making him a well-known character in each anime. However, in Seiken Tsukai, characters have powers from a past life, whilst in Campione, characters assume the powers of characters from mythology. Both animes have Supernatural, School, Romance, and Harem, too.
If you liked
IS: Infinite Stratos
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...then you might like
Seireitsukai no Blade Dance
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Seirei Tsukai no Blade Dance: -Protagonist is the only male in the world that has the power to create a contract with spirits -Protagonist is forced into an all girls school -Harem -Premodern setting in a magical world where shrine priestesses control spirits Infinite Stratos: -Protagonist is the only male in the world who can activate and use an IS mecha. -Protagonist is forces into an all girls school -Harem -Futuristic setting in a world where girls control IS mechas.