Can Riku sense what your character truly is? Go for it.
If so, what are they and can he tell just by a passing 'glance'? He's a light elemental angel, artificially made, but yeah.
On a scale of one to ten (one being Princess of Heart aka nada, thirteen fucking Xehanort), what level of "darkness" do they have within them? He's somewhere in the middle, being light elemental but carrying a lot of guilt over the shit he's done.
What do they smell like? Pine trees, sword polish, feathers, magic.
What is your character's tolerance to dark magic? He's strong against it.
Can he break privacy laws and just teleport to where your character is? Kratos can do that too, so go ahead lol.