How would the the Allies go about a darling that rejected, but the darling seems scared when they did. Not scared of them but something else. Before the nations can do anything, The darling fearfully tells them to stay away from them, because they don't want to see them get hurt or worse killed. After that they ran away. After a good 2 weeks of the darling avoiding them. The Nations go threaten ask the darling's friends what's going on. The darling's friends has told them they have this crazy stalker (Yandere) that's been threatening them and hurting the people they care about. So what are the Allies going to do when they find out that the darling only rejected them to keep them safe and that they actually do love and care about them; that and they have another Yandere after them.

Aph America -   Alfred F. Jones

Alfred would honestly feel offended. What does this mean, babe? Did you think that he was weak and couldn’t protect you? Okay, he knew that you were pretty awesome, but still! He has been training to try and impress you, so, he is even stronger than before! Please, some stalker isn’t going to stop him. Without a second thought, he would kill the fuck! And if it’s a country, he is a big country, he could wage war and put that country into its place! Honestly, Alfred would find your reasoning for not accepting his love very stupid and would punish you after getting rid of the problem. Losing half of the people that you considered close was good enough punishment, right? 

Aph England -  Arthur Kirkland

Arthur wasn’t physically all that strong, that’s why he knew that he couldn’t win against the person in a physical fight, especially if the stalker is someone who is strong like Ludwig. Because of that, he would find different ways of getting rid of your stalker. For example, a poisoned cup of tea, or poisoned food. Worst-case scenario, he could just poison that area's water supply. Yes, many people would die, but if it gets the job done, who cares, yes? Everything is fair in love and war.  After the problem would be taken care of, he would move on to punish you. Avoiding him without telling him anything? You think he was not going to punish you for such a thing? I hope you are ready for some heavy psychological torture because he needs to teach you some new rules, it seems...

Aph France - Francis Bonnefoy

Francis would be horrified, and understanding. It must have been so frightening! He really isn’t sure what to do though... He isn’t that strong, and he isn’t talented in assassinating people in different ways... Oh, wait! He could just hire someone to kill them! Very easy! And if it’s a country, he could make up some lies and deliver them to both Ivan and Alfred, so that country would be destroyed by the two idiots! Don’t worry, he will save you! Afterward, he would officially ask you out, and he hopes you finally accept otherwise.. Well, after what he managed to do, he isn’t going to be a pushover anymore, willing to hurt you to get you. 

Aph China -  Yao Wang

Yao would say that it’s nonsense! Just give him a day or two and that person will disappear. He is a martial arts master, and you need to remember that he has a very loyal family that would do anything just to make him proud. Not even talking about them actually being very talented at martial arts, minus Kiku.. He’s the only one who wanted to be different.  Afterward, Yao would feel very proud, having another reason to show off and explain why he was the perfect partner for you. I mean, he dealt with the problem almost immediately. Now, there is no reason to reject him anymore, yes? 

Aph Russia -  Ivan Braginsky

Ivan would nod, smiling and saying that you didn’t need to worry about the problem. He will go and make sure that the little person is crushed. No mercy for someone who scares his little rabbit. He is the most brutal with his execution, seeing as he will beat the person to death with his metal pipe and won’t hold back at all. After Ivan returns, he wouldn’t even ask if you want to be together, as he isn’t going to let you escape. Clearly, you were attracting very bad people, so, to keep you safe, he is going to lock you up in his small cabin, so the two of you can be together happily.

Aph Canada -  Matthew Williams

Matthew would be completely enraged. Both with you and him. What, you think he is not enough of a man to protect you? Just watch! He will prove to you that he is enough of a man to protect you and after he is done, he will make sure to punish you for ever doubting you. It seems you were like everyone else and didn’t see his true potential.  When he is done beating the person to death with a hockey stick, he returns to take you away. He was nice before but he won’t anymore. He will take you somewhere far away and teach you what happens when you doubt his skills. I mean, he is even stronger than Alfred! He could have killed the person in seconds!