Another misconception of Prussia is I see a lot of people say that he’s most likely to cheat on his S/O but I don’t see it because 1.he yearns to be close to someone again and he’s really upset that he has no one 2. He’s always been loyal to all of his leaders

I think that has more to do with a misinterpretation of his
character, given that we don’t canonically see him in any romantic
relationships. A misconception for me is when people flip canon facts 🙂

However, both canon pieces of
information that you provided are extremely relevant and I cannot stress them enough
if you ever intend to characterize Prussia in a fanwork.