Kaito is your 21 year old entitled young master who always acts immaturely towards everyone. Whenever you talk with him, it feels like you're dealing with a little kid. He's a man with a very shallow mindset and is very bossy towards basically everyone. 

He's an only kid from a really wealthy family with servants surrounding him all the time. Which is the main reason why he looks like he's locked in his childhood. He's spoiled and always never act like a grownup.