The Ghost of the Navigator

the whole point is that light appears to be single. everyone around him sees him as a man who, despite being successful, for some reason never got married and lives alone... he travels alone during his vacations, and if he's not talking to his coworkers or spending time with his family, he's alone.

and he simply likes being alone. that's how everyone sees him. but then there's ryuk, and the truth is that he only lives alone because ryuk's company is the only one he genuinely enjoys.

bc, on top of that, i need to explain that, after thinking more deeply about this au over the last few days, i've realized that it's built around the fact that light yagami would never, ever come out as gay, nor would he have to deal with the pressure of feeling like he should, because at the end of the day, his partner is literally an invisible supernatural creature, and that's the biggest advantage of this relationship for him.

and even though he lives alone, it's obvious that a lot of people would think "light yagami is gay and has a boyfriend hidden away somewhere."

(which is hilarious to me, because i feel like he'd be annoyed by that and think that not even coming across as just a "widower who never got over the loss of his fiancée" (considering that he got rid of misa after defeating near) was enough to give him some peace.)

but technically, that would be a lie, and light wouldn't even need to try to prove otherwise.

but if there's another man who's always with him, no matter who it is, that completely undermines the whole premise of the concept. light yagami is single, but he's always talking to and hanging out with another man, so everyone is going to think "they're gay," and they'd be right! plus, it completely takes the spotlight away from ryuk here.

i created this au bc i simply wanted them to get those days back when life was simple, when it was just living with ryuk without L, without the task force, without the spk, without the mafia, without a second, third, or fourth kira... and without anyone else getting in the way.

in fact, i've literally avoided thinking about how the "kira's kingdom" would be functioning after all these years, or how light would be balancing being kira with being a working adult at this point, bc i just want to think about moonapple

(i even tried to come up with another reason for light to still have ryuk's company that didn't involve kira or the new world, but i'm still working on that!)

As for ways for Light to keep Ryuk without having to keep going with the Kira stuff? That's such a good question and well worth brainstorming, I'm sure there are many possible answers. Though one option I've thought of and would like to write myself sometime would be Light having some kind of revelation/breakdown where he finally deals with what Ryuk said, when he told Light all that time ago in the very beginning that he was "a fine shinigami". Light letting go at last of his need to cling to a humanity that, I think, he isn't really that comfortable with and doesn't truly relate to. He understands humans very well, yes; but there's an intellectual distance, a kind of disgust, in how he does it that makes me think he doesn't, at the very bottom of his heart, identify with them.

But, y'know, that's not a feeling you're Allowed To Have. So Light doesn't look too closely at himself and he never accepted that long-ago compliment from Ryuk because he doesn't want to find out that actually, maybe he is in some sense a monster, and also maybe he's better at being a monster than he is at being a human. But if he finally looked and did find that out, and came to terms with it... I think he could let himself stop being Kira, then. But he'd definitely have more reason than ever to keep Ryuk. 🖤

If your vampire physics are subject to psychic or spiritual imprint, then no, they cannot, because the person who issued the warrant does not have a psychic connection to the residence and is not, according to vampiric physics, able to overrule the consent of the resident.