My guess based on spoilers is:
That based on the “Distinguished Gentleman” they are casting, that they are making Hades a very devil-like character and in European legends and folklore the devil appears often in the form of a dragon. This and the Lily’s name make thing that she is gonna be Hades daughter.
Wasn’t there even a disney cartoon episode in which Hades tries to flirt with Maleficent? I can barely remember watching something like that.
[adrotate group="5"]
“There were thousands and thousands of forms of joy in the world, but that all were essentially one and the same, namely, the joy of being able to love.”
— from the Neverending Story by Michael Ende