She kinda acts 更多 maturely. She's fond of gambling and quite good at it (afterall, Monaco is a gambling center.). And she also doesn't mind if some 随意 guy (pertaining to Seborga) would come flirting on her.
That's Monaco. She's a bit uptight and act very mature eventhough she sees herself as France's little sister. She's an excellent gambler and If 你 go against her 你 will lose because she almost always wins.