Inasmuch as kids draw from both their parents, SM's upbeat goofiness comes from her dad and her gentle kindness comes from her mom. And yes, he was a very popular and beloved King Consort. Hyperion was comparable to... Peter Pan in some respects, he never wanted to grow up but as he told Serenity Phoebe Selene, "If it means I can help you help people, growing up won't be so bad."
He left the fancy speeches to his wife while he took local kids to candy shops and then to the park where they could play Frisbee games* thus endearing himself in everyone's heart. His kindness and genuine charitable work (think a boy version of Princess Diana) mean that the whole solar system loved him. Alas, he died shortly after little daughter was born. That's because his sister-in-law Nehelania Hecate Selene** sought to harm the newborn Princess Serenity Angelique Selene and he died protecting his little girl.
Queen Serenity lost her husband to death and her sister to imprisonment that day. All she had left was her little Serena... who bore her father's golden hair. But yeah, when Serenity died at the fall of the Moon Kingdom, Hyperion was there welcome her to the afterlife. Now, they'd be together forever.
*In my fanfic, I say SM got her tiara/frisbee throwing skills from her dad!
**Always was a fan of the theory that the two moon queens are sisters