Billy and Phantasma's Wedding

Bride-Phantasma Phantom (from Scooby-Doo! and the Ghoul School)
Groom-Billy Joe Cobra (from Dude, That's My Ghost!)
Best Men-Spencer Wright (from Dude, That's My Ghost!), Danny Fenton (from Danny Phantom), and Lincoln Loud (from The Loud House)
Bridesmaids-Sibella Dracula, Winnie Werewolf, and Elsa Frankenteen (from Scooby-Doo! and the Ghoul School)
Ring Bearer-Melissa Screech (from Toonsylvania)
Flower Girl-Tanis Mummy (from Scooby-Doo! and the Ghoul School)
Minister-BeetleJuice
Organ Player-Lydia Deetz (from BeetleJuice)
Maid of Honor-Shareena Wickett (from Detention!)