Niffty is hyper, spontaneous, and agile, being very quick on her feet. She is easily entertained, easily distracted, and easily excitable. She dislikes when there is a mess in any room, and has a fixation on men in general.

However, she appears to only like "bad boys", including a brief obsession with Sir Pentious. This ends in her kicking him in frustration after he apologizes and decides to seek redemption at the hotel. She isn't afraid to get dirty, and enjoys cleaning everyone's messes with a gleeful, yet creepy charm.