▁DC ▁publication ▁line ▁in ▁ 2 0 1 1 . ▁ ▁Cass andra ▁C ain ▁ ▁During ▁the ▁No ▁Man ' s ▁Land ▁story line , ▁Cass andra ▁C ain ▁was ▁given ▁the ▁role ▁of ▁Bat g irl ▁under ▁the ▁guidance ▁of ▁Bat man ▁and ▁Oracle . ▁Writ ten ▁as ▁the ▁daughter ▁of ▁assass ins ▁David ▁C ain ▁and ▁Lady ▁Sh iva , ▁she ▁is ▁trained ▁from ▁early ▁child hood ▁to ▁read ▁human ▁body ▁language ▁instead ▁of ▁developing ▁ver bal ▁and ▁written ▁communication ▁skills ▁as ▁part ▁of ▁her ▁father ' s ▁condition ing ▁to ▁m old ▁her ▁into ▁the ▁world ' s ▁dead liest ▁assass in . ▁However , ▁after ▁comm itting ▁her ▁first ▁murder , ▁she ▁v ows ▁to ▁never ▁again ▁use ▁her ▁mart ial - arts ▁pro w ess ▁to ▁kill . ▁In ▁ 2 0 0 0 , ▁she ▁became ▁the ▁first ▁Bat g irl ▁to ▁star ▁in ▁an ▁e pon ym ous ▁month ly ▁com ic ▁book ▁series ▁as ▁well ▁as ▁one ▁of ▁the ▁most ▁prominent ▁characters ▁of ▁Asian ▁descent ▁to ▁appear ▁in ▁American ▁com ics . ▁The ▁series ▁was ▁can ce led ▁in ▁ 2 0 0 6 ▁and ▁Cass andra ▁C ain ▁abandoned ▁the ▁role ▁of ▁Bat g irl ▁shortly ▁there after . ▁Years ▁later , ▁Cass andra ▁rejo ined ▁the ▁Bat man ▁family ▁under ▁the ▁mon iker ▁Black bat . ▁ ▁Steph anie ▁Brown ▁ ▁Steph anie ▁Brown ▁was ▁formerly ▁known ▁as ▁Spo iler ▁and ▁then ▁as ▁the ▁first ▁in - continu ity ▁female ▁Robin ▁until