Seven is a person who likes jokes and tries to be funny. However, these jokes seem to usually fall flat, and no one seems to like them.
Seven cares only about being in the spotlight, according to Eight. Seven is a whiny person, due to them crying over not being in the sub count (and therefore not being in the spotlight) in "Thanks for 600,000 subscribers!". As well as being selfish, they are stubborn and uncaring to an extent, shown by them being unwilling to help the other numbers 