Here's my theory, and don't be afraid to challenge it.
But, what if Husk from Hazbin Hotel is Hades' child too? The timeline makes sense. Husk died around 1970 due to old age, and Hazel died around the same time. Husk's attitude matches Nico's and and he's a cat. Conner's (my OC) animal is a cat. Hades' children are often associated with dark creatures (hellhounds, cats, bats). What if Husk (his real name is Henry) is a child of Hades and he just flew (haha. I'm not funny.) under Zeus radar because why not?
Please correct me if I'm wrong. Please challenge me if this bothers you.