Yuu☆Yuu☆Hakusho, JoJo no Kimyou na Bouken Part 4: Diamond wa Kudakenai Recommendations
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 mangas involve 90's teens who have supernatural powers. (The duo of Yusuke and Kuwabara in YYH is very alike to the Josuke and Okuyasu one). Both mangas involve very original powers mixed with hilarious humour, battles and slice of life style. Although Diamond is Unbreakable is more Slice of Life and Yu Yu Hakusho is more battle shonen, they're very alike and if you liked one of them you surely like the other.