Hercules child could be Eucleia (child of Hercules and Myrto in mythology and female spirit of Glory) and she could wear armor on her top like Pyrrha Nikos in RWBY (If you don't know what she is google her and you'll see what I mean). She could be strong like Hercules but sassy like Meg.
I am aware of the existance of Haddie but Hayden Hades sounds cooler. Maybe it Haddie could be a nickname and Eucleia will be like the only character calling him Hayden because they are close "Hey wassup Hayden" "I told you not to call me that" "Please! Everyone knows Hayden is cooler". I would refrain for a sibling cause siblings are mostly female (Zevon and Yzla, Harry and CJ)
Oh and the Underworld could be located under the Isle. Also Haddie should be a son of Persephone. She was so unused in the series and movie. Now they can use her as a way of explaining Haddie/Hayden existance.
Peachycream wrote: Here are the characters I've came up with for Descendants Wicked World.
Doug-Son of Dopey
Chad Charming-Son of Cinderella and Prince Charming
Anxelin-Daughter of Rapunzel and Flynn Rider
Amir-Son of Aladdin and Jasmine
Elena-Daughter of Elsa
Addison-Daughter of Anna and Kristoff
Melody-Daughter of Ariel and Eric
Sophie-Daughter of Snow White and the Prince
Mina-Daughter of Hiro Hamada
Liam-Son of Pinocchio
Peach-Daughter of Giselle
What about diavals daughter? and we could name her Dj she should be voiced by Peyton List. She'll have raven wings. I know I know. the only reason why she's human. Watch the movie Malfcient and you'll understand