Personality: jackhammer is a happy go-lucky type character and he acts kind of like kaminari but much smarter, he is the only student of NHL ever to get more than 18 recommendations with 23 so he holds the record of having the most recommendations for NHL but is obsessed with strength and hard work as his maximum used to be one punch every 10 seconds but through sheer determination and hard work his maximum is now 10,000 punches a second but he just usually keeps it at 1000 punches a second 

Costume:

Sorry I can't draw for shit