Believe me or not, when I first saw Pitch, I was all like "Remind me of Hades", and then, I was thinking of Eris too. Finally, I saw connections between them. Originally, I didn't want to add Ember, but I changed my mind.
The "Hades and Eris had kids (Pitch and Ember)" thing reminds me so much of "Hawkeyes and Black Window had a kid (Merida)" thing, don't you?
Hades belongs to Disney
Eris and Pitch belongs to Dreamworks
Ember belongs to Danny Phantom