User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-4095436-20150809052838/@comment-26865730-20150810003427

As sad as this may be, it could still turn out that Lillith is in some way unstable due to the way she came to be plus the meddling of Rizevim.

I'm just saying, she may not be a permanent character.

She may also end up doing for Vali what Ophis did for Issei?