How to become a delinquent? 
Well, you have to do what Osoro Shidesu to do if you want to join, you have to dye your hair blonde to be an official delinquent and apart of the group.
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What do delinquents use to fight: They use their hands to hit/punch or feet to kick them or metal poles to knock whoever they are fighting unconscious or a baseball to knock whoever they are fighting unconscious. 
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