Dick Grayson Had Grown up with his childhood friend Barbara Gordon and were gonna be together however one day joker paralyses her and Tortures her father as Barbara couldn't have kids anymore which made her sad however when they are on a date they Hear gunshots and finds a couple who's been Murdered and in their Arms was a baby Boy with green Hair as they don't want him to be an orphan so they give his parents a Burial and Adopt him raising him as their Own and Years later Izuku is ordered to protect Students at UA and Izuku is shocked when he meets his long lost sister and older siblings 

Izuku X Harem

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Cassandra Cain (Batgirl)