 If you liked
JoJo no Kimyou na Bouken
|
 ...then you might like
Baoh Raihousha
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Both are old-school OVA. Both have main character that fights agains some sort of evil. Both main characters have som sort of alter ego, but while in Baoh Raihousha the main character changes into it, in JoJo's Bizarre Adventure main character summons it. Both have similar old animation and are violent, even gory. Both are based on manga by same mangaka.