 If you liked
Yuu☆Yuu☆Hakusho
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 ...then you might like
JoJo no Kimyou na Bouken Part 4: Diamond wa Kudakenai
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Both manga involve Japanese teenagers gaining supernatural powers. Some characters in both series are quite similar to each other (Yusuke & Josuke, Kuwabara & Okuyasu, etc.). They can also get quite dark and grim by Shonen Jump standards, although "Diamond" has a lot more bizarre/wacky moments. Both were also written in the '90s.
Both have delinquent protagonists. They both suddenly find out about a mysterious power, and they have potential to be strong.
Both are also made around the same time in the 90’s.
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Recommended by SteamedPlague
Both are 90's battle manga with delinquents and school life, sharing also storylines involving spirits. Diamond is Unbreakable focus on the city's side characters (it's somewhat more gorunded, whatever that means on a jojo story) and Yu Yu Hakusho goes to develop a bigger spirit world.