User blog comment:B214/Volume 22 spoilers/@comment-24583889-20160730034934/@comment-9595671-20160730055556

And a third possiblity I recall being mentioned? Lessthan actually sounds close to a certain Devil name... Leviathan

Rizevim's existence proved the original satans' likely didn't only have one descendant remaining, so it's likely she could be from the Leviathan line too

If that's the case this applies for the same reasons as Belial and Astaroth as Katerea likely tarnished their name for her actions, as likely did the actions Rizevim and the other descendants except Vali.

It would be interesting because so far Vali's pretty much the only good character that's an actual relative to the Satans' bloodline, all the others have been antagonists.