Is it just me or I´m really getting a Freddy Krueger vibe from the secon pic in the OP? I really wanted Cruella to show up, but now that I have seen Mader as the WWW I´m actually pretty excited.
I have a crack theory that they might be mashing up the Wicked Witch and Cruella as one character. I mean we had Pan as the Pied Piper, Rumple as the Beast, and Lana as Ursula (sorta), so who knows: https://oncepodcast.com/forums/topic/312-promo/page/5/#post-231113