Rias gremory is the primary female protagonist of high school dxd The occult research club is a front for rias gremory's peerage (servants). Born as a pure blooded devil from a prestigious and powerful clan, the gremory
She is also the sister of sirzechs lucifer, the. Upon arriving at the gremory region, issei, along with rias and her peerage, is greeted by the servants of the gremory household before meeting rias' mother, venelana gremory, and nephew, millicas. Issie is formally introduced as a member of the research occult club and as a pawn in rias gremory's peerage
Sirzechs was originally the heir to the gremory clan but due to the conflict of the satans faction wanting to continue a war against the angels and fallen angels, sirzechs alongside with ajuka.
