Ami is known for her girly-girl and goody-two-shoes personality. As the optimist, Ami always looks on the bright side of things and finds a solution to every situation she is involved in. She loves rainbows, bunnies (cute animals), sparkles and anything else typically pretty, which is the opposite of Yumi, who likes things more targeted to a tomboyish and unisex demographic.
She also cares a lot about how other people think, and tries not to be selfish. This makes Ami willing to help everyone and find solutions for anyone she cares. On the other side, however, she also hides her real mind and opinions in order to never disappoint others.
In the pilot, she was depicted being less comical.
Bubbles is a slender, fair-skinned girl with blonde hair in two pigtails in a neat, curved fashion with blue hair ties and light blue eyes. Her dresses are light blue with a black stripe in the middle, and she wears white tights and black Mary Jane shoes. During the first short, after Fuzzy Lumpkins hits her with a meat gun, her right pigtail becomes a chicken leg.
Ami can play her drums with her bare feet, as seen in both "Ami Goes Bad" and "Mean Machine." Some episodes such as "Julie AmiYumi" shows that she is also capable of playing electric guitar like Yumi, who is main guitarlist of the band. Ami can crush a handheld gaming device with her hand as seen in "The Legend of Mei Pie". She is also a ninja like Yumi, though not as skillful as Yumi. Ami can also throw things far away as seen in "Gridiron Maidens", because of always pounding on the drums. She is also capable of performing hypnosis, which was revealed in the episode "Olé!" when Ami and Yumi team up to hypnotize El Diablo, the bull that the mayor of Los Gatos Feos made them fight.
Some episodes and intermission music videos shows that Ami is capable of driving various vehicles, such as her own scooter, the tour bus and a prop plane.