Lola is conceited and bratty, and dresses like a princess. Lola's interests include anything girly - this includes fashion shows, makeup, and posing for photo shoots. She is narcissistic, as she is constantly claiming how beautiful she is, and can't look away from a mirror for more than five seconds, as seen in "Undie Pressure".
As seen in many episodes (such as "Undie Pressure" and "Sound of Silence"), Lola will assume the role of an antagonist when her siblings anger her. She is skilled at plotting and scheming to get her way. She has the most volatile temper of any of the siblings, and so they, especially Lincoln, are careful not to get on her bad side.
She's a tattle tale, because no one can tell her a secret without her immediately telling them to other people, as seen in "A Tattler's Tale". Lola is also a very manipulative person, like in "A Tattler's Tale" where she threatened her siblings to tell to their parents their secrets, if they don't obey her mandates.
In spite of her harsh and self-centered nature, Lola is also compassionate, and loves her siblings. She is always grateful for Lincoln's kindness towards her, and usually appreciates her family's company. At times she has shown herself to be capable of humility, and selflessness when compelled to let go of her own needs, so she isn't heartless.