Oh, how would the yandere skeles react to a complete kuudere loner target? Like, they don't have anyone close to them who they could attack and they never really react/care about their obsessive actions, least not at first. Like, they could threaten them to their face and they just keep cool and calm and talk them down or something (whether they're freaking out internally and hide it from them well is up in the air). Sorry if this is too much...
SansFinds your stoic nature a bit unsettling if he's being honest. He’s just not used to people not reacting to the things he does. Of course the fact that you make him feel anything at all is a miracle and the reason he keeps you around.
PapyrusI mean he thinks you're perfect just the way you are. The fact that you have no friends is just a blessing to him. Why would he want anyone else getting close to you when all of your attention should be on him anyway?
RedFinds your attitude both refreshing and annoying. He wants you to react to him most of the time but other times, when he does something truly horrible, he’s thankful that you seem to have no reactions as long as you’ll say you love him he’ll be fine.
EdgeHe’s actually very thankful that you don’t react to his threats. It’s one of the things that drew him to you in the first place. Most people are usually scared of him because of his appearance but you never seem to flinch which is why he finds you so interesting.
BlueThe two of you get very close very quickly and not necessarily in a good way. You are basically a prisoner in his house and he is not letting you leave anytime soon. It’s just a lucky coincidence that you don’t have anyone close to you
OrangeThe fact that you don’t have many friends actually suits him better. He gets jealous very, VERY easily, to the point of you simply saying hi to someone could make them end up dead on the news. He thinks the less reaction you have the better. Means he won’t feel guilty.
Berry The fact that you don’t react to his threat annoys him the most. In fact he’s going to step up his game just to see how far he can push you before he gets a reaction that he wants out of you. Prepare to be put through a lot of shit.
SyrupHonestly having no one close to you just seems really convenient to him. The fact that the two of you have the same disposition just makes him more appealing to him. The both of you do seem a bit weird to the outside world as nothing ever seems to bother you.