Ami Onuki is one of the members of the rock band Puffy and the deuteragonist of the series. She is a drummer.
She has cerise hair tied up into two buns. She also mainly wears a pale yellow flower at the bottom of her right bun.
She favors the pop of bubblegum and wears a go-go dress that has a yellow and yellow shirt shirt part and a yellow and pink skirt, also carrying a daisy in her hair, a white watch and a right wrist and a red bracelet on her left wrist, and white knee-high go-go boots.
For sleepwear, Ami wears a pink sleeved nightgown with a flower in the middle.
For the swimsuit, Ami wears a light blue bikini with a yellow heart and a flip-flop olives. She previously had a lime green ribbon with her flower patterns on it, which was eaten by a shark in "Surf's Up", while she and Yumi got lost in the ocean because they were bad at surfing.
For ninja wear, Ami wears a lavender ninja outfit with a lavender balaclava.
For Magician assistant outfit, she wears a light blue hairband, light blue swimsuit and gold pumps.
In Toon cup 2012, She has a blue shirt.
As the optimist, Ami always looks on the bright side of things and finds a solution to every situation (being two years younger, yet acting less mature than Yumi). She loves rainbows, bunnies, sparkles, and anything else typically girly, which is the opposite of Yumi.
In Toon cup 2012, she was depicted being less of a girly stereotype.
Ami can play her drums with her bare feet, as seen in both "Ami Goes Bad" and "Mean Machine". 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 or as Yumi (which leads to her ultimate demise later). Ami can also throw things far away as seen in "Gridiron Maidens", due to always pounding on the drums. She plays football in Toon cup 2012 and .