Nathanael is a kwami. Aeon can't see him.
Ok, but now imagine:
"Hi, I'm Naell, the kwami of the human miraculous. You just have to say 'Naell, let's get biped' and you'll have the power of anxiety and no, you won't get any transformation because you'll look exactly like you"
hey remember when they just FORGOT Nathaniel in Zombiezou that was wild of them huh