Try imagining nothing (darkness doesn’t count because that’s still a color so it’s still something). You can’t because you’re unable to experience “nothing”. Same with blindness but for sight.

Then I would take it the right way in that scenario

Idk if someone I didn’t know well said that to me id probably assume they were acting like I was too dumb to understand even if they didn’t mean it like that

That can come off as condescending

I don’t think you properly grasp the concept of what a narcissist is. In a work of fiction the world SEEMS to revolve around the fictitious character because their perspective is the only one you’re given and the story revolves around events that occur to THEM so you empathize with them the most. But that does not mean the world revolves around them and even if it did (like some fictitious characters) that still does not make them a narcissist because a narcissist is by definition someone who has an inflated sense of self importance, whether they are actually more important or not has no effect whether they are narcissistic.

So unless a character outright states or acts like they’re worth more than other people, they are not a narcissist. Even if in the story everything is about them.