Orochi Shermie/Story

The King of Fighters '97
It's not known when Shermie realized she was a Heavenly King. At the end of the '97 tournament, Yashiro Nanakase, Shermie and Chris activate the Riot of the Blood within Iori Yagami and Leona Heidern as a part of their plan to resurrect Orochi. When both Leona and Iori are defeated, the New Faces Team reveal themselves as the Heavenly Kings and fight the player's team. When they are defeated, Yashiro and Shermie commit suicide in order to transfer their remaining energy into Chris, thus allowing Orochi to be resurrected back into the living world via possessing Chris' body, but Orochi itself would later be sealed away by the combined efforts of Iori, Kyo Kusanagi, and Chizuru Kagura.

The King of Fighters XIV
Verse's defeat during the events of The King of Fighters XIV had released numerous souls and caused many who had died throughout the series to be brought back to life. Shermie is apparently one who has been revived, along with her comrades Yashiro and Chris.

SNK Heroines Tag Team Frenzy
As per her canonical appearance in SNK Heroines Tag Team Frenzy, some aspects of her heritage and this persona seeps into her normal form.

The King of Fighters XV
In KOFXV, they get the shard described to be more powerful than Gaia itself, and sets in motion to end mankind all at once. However, they end up in a pyrrhic victory where they (and Goenitz) are the only living things remaining on the now-desolate Earth.