I'm planning on making a series called "31 Days of Mpregween." For each day in October, I'll make mpreg fanart of villains and / or Halloween-esque characters, and post them on Furaffinity, Twitter, and Tumblr! (If any of this sounds familiar, this is because I tried doing this last year, but I decided to push it over to this year. :[)
So yeah, share some ideas!

Confirmed subjects:
Bowser
Bruno Madrigal
Dio Brando
Discord
Freddy Krueger
Hellboy
Jack Skellington

I'd love to share more, but I don't want to ruin the surprise. ;3

UPDATE 8-4-23
I made a Google Form for your suggestions! Fire away! https://forms.gle/ChMYGmg5j8D1rhFv6