Welcome to Hetalia: Axis Powers Answers. What would you like to know?

As in, what does he say a lot? I guess he calls himself "awesome" a lot... some of the more popular things include Prussia occupying your vital regions and also the whole "Prussia's five meters" thing...

Actually, Prussia never said anything about "vital regions", that was said by Austria and Hungary during the War of Austrian Succesion, Poland while playing chess with Lithuania, and Spain when he dreamed Romano jumped on him and "crushed (his) vital regions!" The "five meters" isn't even in the manga, anime, or webcomic, that actually came from the fandom.