I haven't encountered him myself, but I've had NiGHTS-related dreams. It was either merchandise-related, like watching a TV-show, or it one of those times when I wasn't myself. If that makes sense. And even then I felt afterwards like I had played a role XD
I had similar, in a fashion. I never saw NiGHTS himself, but in one of my dreams, I did wind up seeing Ideya...red and blue, actually. (Ha...polar opposites...) I honestly don't know how I'd react if I ever saw him myself. I'll know if and when I do see him, though.