User blog comment:B214/Shin DxD 1 discussion/@comment-28884330-20180719181027

Unconfirmed spoilers from reddit (again, not confirmed so take it with a grain of salt, but seems likely):

"By the way, the new girl is a devil/human hybrid. She's a Longinus possessor and she's a descendant of Leviathan. Basically an existence similar to Vali."

"More info on the new girl and her Longinus. She can manipulate Dragons and the Ocean. She can command Dragons to attack and summon Tsunamis to destroy cities. It is speculated that she has the potential to even manipulate Dragon God and True Dragon. She resonates with Ise's Queen piece. She holds no evil intentions and her 8 wings are because of her superior bloodline"