Hunter X Hunter vs Yu Yu Hakusho
Connection:
Both are green-cladded protagonist created by Yoshiro Torigashi
Both have similar pasts in how their fathers abandoned them for their own jobs,, leaving them them under care of another family member (Aunt Mito and Yusuke's mother)
Both are also titled warriors known for fighting monsters (Monsters and Chimera Ants for Gon and spirits and demons for Yusuke)
Both are often pitted with each other in Japanese magazines for Shonen jump games like Jump Force and a part of the opening in J-stars