How does XV relate to Hamlet?

If I'm being honest, I don't actually see too many similarities. I mean, he's the son of the King (Regis) and it does seem like we're shaping up to lose Regis because of Idola Aldercapt and his invasion; but Hamlet's father died by his brother, and so far we haven't seen anything that suggests Regis has any other relatives but Noctis. And Stella doesn't seem like any sort of Ophelia to me.

Anyways, I'm wondering if someone can explain to me what people are seeing that relates it to Hamlet?