Satannish

Satannish is also a demonic entity with whom Doctor Strange has clashed since his early days. A Hell Lord, Satannish was created by Dormammu and is, basically, a physically imposing green monster. His special ability is that he can grant mortals mystical powers "“ this comes with a price, though, this being the mortal's soul.

Mads Mikkelsen can also be this character, who has also been an ally of Baron Mordo in the comics. A relatively unknown villain, he can be the perfect choice before bringing in the better known Doctor Strange supervillains.

In this case, Mads Mikkelsen may sign for more than just one single Doctor Strange movie. And even if he doesn't, Satannish is the perfect way to introduce the powerful Hell Lords into the MCU.