No. [Riku wishes he had a better answer for her—but the lure of the Dark is part of who he is in every way. He knows that it could have ruled him at one time, and did. Even his denial, his belief of being stronger, was laden in the types of emotions and thoughts that fed into that Darkness.]

That's not a bad thing, though. There's no real danger of this. Not anymore. [He motions to his eyes.]

But the rest—that Darkness is my power now. Even though I used it as a part of how I fought to protect my friends, I still became a keyblade master. Wielding it the way I did made me one of a kind. [He shrugs, accepting that. His eyes don't turn any less yellow. That seems to be a figment of the dream.]

My head doesn't stop working the way it did. It's better most days, but ... you can't just reverse the way someone is. It's about realizing that. And accepting it.