Agatha: Coven of Chaos Reportedly Won't Include a Mephisto Appearance
A huge misconception I keep seeing in the Marvel community is that Agatha Harkness is a bad guy/servant of Mephisto. We don't know that the same is applicable in the MCU, but
WandaVision: Agatha Harkness Has Some Big Mephisto Connections
WandaVision Agatha Harkness Or Nightmare Or Mephisto Villain Koun Hai ? - YouTube
Agatha's Origin Story Explains Why Mephisto Isn't WandaVision's Real Villain
MEPHISTO AGATHA | Women Ankle Boots Brown Leather Nubuck
MCU's Mephisto is Aubrey Plaza in Awesome WandaVision Spinoff Art
WandaVision: Kathryn Hahn Reflects on All Those Mephisto Fan Theories