I love Steven Universe! It's one of the most queer positive shows out there- and even more impressive since it's an animated series.
They manage to depict really powerful, emotional stories mixed in with a lot of action and comedy. There's a layer to it that's meant to be appreciated by a more mature audience without alienating the kids.
Themed TV is not about overt sexual content- it is about being relevant to or touching on gay issues and Steven U definitely does that. It would be a good fit there.