Keek

In Restart, she's the primary antagonist and the game master who pulled all the other Magical Girls into her game.

The Magical Girls she abducted were specific in that they were all survivors of Cranberry's selection test, also known as "Children of Cranberry", with the exception of Lapis Lazuline as Keek had mistaken her for her mentor who was an actual survivor. Her motivation behind the game was to find the Ideal Magical Girl who could reform the Magical Kingdom.