Though having minimal screen time in Arc 5 and not appearing in the following Arcs, she played a mildly-considerable role in taking down the Sin Archbishop of Greed by providing the Greed Subjugation Squad with valuable info about Regulus. Following her husband's death, it's unknown where she went or what she's doing.
Sylphy is a woman with golden blonde hair and dark blue eyes. She has similar hair to that of Emilia and noticeable cute features. She also wears a dress.
Due to years and years of having to live in fear of being killed for even smiling in front of Regulus, Sylphy developed a cold and emotionless personality which might have made her look like an empathic and uncaring person, though that couldn't be further from the truth.
Somewhere in the past, Sylphy lived in an unspecified village in the mountains, before marrying Regulus Corneas, becoming his 184th wife. According to her, in order to marry her, Regulus slaughtered her family, friends and everyone from the village who knew who she was.
During the battle, Emilia tried to ask Sylphy for a way to save everyone and stop Regulus, to which she responded that there was no way. Sylphy was ready to kill herself, but Emilia didn't agree with such solution. The wives, including Sylphy, were frozen by Emilia's magic, so that Regulus wouldn't be able to use his authority. After Regulus Corneas was successfully defeated, Emilia freed all the wives.