Nemes

In fact, she uses the staff to restore the heroine's lost memories.

Isis' real first gameplay appearance was in the sequel Majin Tensei to Spiral Nemesis.

And ever since then, Isis has been a mainstay demon predictably in almost all of the Heavy Hitter Atlas installments across the series.

So due to Isis's place as a staple demon in the series, she has a good handful of various designs over the years.