 If you liked
Konjiki no Gash!!
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 ...then you might like
JoJo no Kimyou na Bouken Part 4: Diamond wa Kudakenai
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These two good works have these points in common:
-People fighting against each other
-Weird creatures, in JoJo they have the spirits called stands, in Zatchbell the demons called mamodos
-Each fighter have their own hability
-Long duration, centered in the main characters, but with enough time for the secondary enemies and allies
-Both main characters have in common an absent dad, and a strong will of fighting
-The fights are tough, and no one wins one without effort
-They fight for some good purposes