Leo is cheerful, prone to making jokes—sometimes at inappropriate times—and uttering quips he believes "fire up the team" as expressed in “Donnie's Gifts. His persistently carefree nature causes him to possess an airy quality and he enjoys spontaneity. It's also said in the first episode of the series that humor is how he manages to cope. Leo has confidence that usually turns into arrogance and his brothers are often annoyed by his lack of humility, making him difficult to play games with, such as in "Lair Games". Leo is known to be a compulsive liar as seen in "Flushed, but Never Forgotten". He doesn't like being in trouble so he makes his brothers promise not to tell Splinter about Piebald’s fate, even willing to hurt Michelangelo if he tries to tell the truth to Splinter. Leo can be disingenuous as it is not unusual for his charisma to take the form of false flattery just to get into someone’s good graces as seen in “Todd Scouts” and “Bad Hair Day”. His family is aware of this and
Speaks in measured, professional bursts; tends to explain what he’s checking as he goes.
