If you liked
Hypnosis Mic: Division Rap Battle - Rhyme Anima
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...then you might like
SK∞
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Both are heavily influenced by rap and Japanese streetwear/street culture. They also have colorful characters and feature characters in a unique type of battle. These battles take place in an underground setting that only characters who are worthy have access to.
If you liked
Yamada-kun to 7-nin no Majo
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...then you might like
Masamune-kun no Revenge
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A very similar vibe/atmosphere. Both also have secrets that get uncovered as the series goes on
If you liked
Bakuten Shoot Beyblade
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...then you might like
Tiger Mask W
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Both of these anime are extremely campy, but not in a bad way. They take the sport in their anime so seriously that one can die from it. If you liked one, you'll like the other. Also, watch Beyblade in sub because the dub track is really lackluster.
If you liked
Petshop of Horrors
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...then you might like
Kyuuketsuhime Miyu
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Both have a very similar gothic vibe and both have similar character dynamics (the normal human that thinks what the protagonist, the one who dabbles in the supernatural, is doing something wrong and tries to stop them.) Both are also OVAs that have great music and are best watched around Halloween. If you liked one, you'll like the other.