So, Starfire isn’t a Kryptonian. But she gains her abilities from ultraviolet light, just as Superman, and any Kryptonian for that matter, gains their abilities from a yellow sun. A certain type of ultraviolet light. Starfire is, in a few ways, not as limited as a Kryptonian, ie she can absorb energy from any light, including a red sun, but any light around can be absorb into her body for her powers to work. Other than the orangish hue to her skin, her insectoid eyes, and her fire-like hair when she flies she’s still pretty humanoid.
Imagine if she and Superman had a child?!
We’ve seen the product of what her’s and Nightwing’s kid looks like, pretty much the same as Starfire but with black hair. I wonder if it’d be possible for Superman to have a child with her, their kid would be soooo strong. All the powers of a Kryptonian and a Tamaranean, with no weakness from a red sun.