I full heartedly accept this headcanon and now want a picture of Prussia's daughter Königsberg. And honestly, this could kinda explain my idea I have for 2p!Prussia (Klaus) and why he's always so angry with everyone.

(My 2p!Prussia headcanon starts here)

He's angry and hates almost every country due to the fact they did nothing to help save his daughter. He knew he made mistakes, but he also knew that Königsberg didn't have to pay for them. He tried keeping her safe from everyone. For most, Königsberg was his only weakness

And Klaus hates Russia the most for taking away his only child and the most important person to him...

Due to the fact that Klaus can't speak, it prevents him from getting his anger out and talking about her, not that he'd want to. Talking about her would make him feel guilty again since he couldn't save her. And he can't bear to go through the memory of that again...

Whenever someone mentions her, Klaus almost goes into a fit of rage, but he knows that hurting someone won't bring her back...