Cassandra Cain
Cassandra Cain ( also known as Cassandra Wayne ) is a fictional superhero appearing in American comic books published by DC Comics , commonly in association with the superhero Batman . 
<triplet> Cassandra Cain <subj> superhero <obj> instance of <subj> Batman <obj> sidekick of <triplet> Batman <subj> superhero <obj> instance of <subj> DC Comics <obj> publisher