Sonja is a girl guppy with a personality as small as her nose! Unlike her sister Deema, she's not completely energetic and isn't used to being the center of attention, but she's also good friends with everyone else, even those who are evil, such as Dark Booster, so everyone is always her friend for life. Her voice is usually timid when she speaks and sings, even though she also boasts an advanced vocabulary for her age. She also does everything in an understated fashion, even in the same scene. Whether she's doing store or leading the audience in whatever dance she chooses, Sonja's style is always "underneath-something-to-behold"!
Sonja has tan skin and green eyes. Her tail and bikini top are orange streaked with blue, red, purple, green, yellow, peach, black, white, grey, brown, gold, silver, gray, indigo, platinum, violet, bronze, pink, copper, tan, pale orange, dark tan, dark brown, very pale beige, turquoise, beige and mauve. She has long, straight, let-down, 60s-style brown hair that always just happens to be done up in a ponytail with puffy bangs and some in a bun down to the bottom of her fintail, hangs freely and is streaked with blue, red, purple, green, yellow, peach, black, white, grey, orange, gold, silver, gray, indigo, platinum, violet, bronze, pink, copper, gray, tan, light tan, pale orange, dark tan, dark brown, light brown, very pale beige, turquoise, beige and mauve.
- Sonja is one of the more timid guppies and also one of the many guppies that hardly ever smiles. The others are Luigi, Rakugaki Snicker, Anna, Nonny, Gyoginowaruidesu Cobalt, Hanshakaiteki Alabaster, Bureina Gojadiak, Kashikoidesu Arbiminak, Thundertail, Hanemasu Splattery, Sagurimasu Gloobert, Kidoairaku Cadabrin, Saidaionryo Larry, Shojikina Blueberry, Yojiremashita Swirly, Denatsu Patrick, Nurimasu Choco, Rorupan Cinnamon, Angie and Yukana Vanilla, etc.