As she was raised with luxary and wealth, Sonia tends to be snotty, whiney, and spoiled. She hates getting dirty and constantly worries about her hair and clothes. Although she acts selfish, she is really good-natured and helps those who are in need.
Sonia is very self-sufficient and does not hesitate in taking on any threat or challenge that she may encounter, most of the time coming out on top. She likes to think things through and on some occasions, has to help out her brothers (Sonic and Manic) when they are in trouble (Even though she sometimes thinks of them as nothing but pain).
Sonia is physically stronge, like Knuckles, when compared to her brothers. She is able to lift heavy objects as well as destoy barriers of various materials. She is skilled in martial arts, which she uses for offensive and defensive measures, and is also extremely agile. She does not have Sonic's speed, but is able to use "Sonia Spin", where she spins around in a horizontal axis (Similar to Taz from Looney Tunes). In addition to the Sonia Spin, she has a Pink motorcycle to travel with.
Sonia's medallion necklace transforms into a Keyboard Synthesizer which is capable of firing lasers blasts as well as creating smoke screens. The Keyboard also transforms into a laser riffle which uses to attack sometimes.
Sonia, her brothers, and other characters in the Sonic Storm Adventure Series are members of the band "Sonic Underground", they perform many different songs as they travel, and when credits are rolling. Her instrument of choice is the piano, she has been great at playing the piano since her childhood. Her singing voice is so remarkably different to her regular voice that is sounds country-like, as opposed to her high pitched, "girlfriend" voice.
- Sonia has a love interest for Knuckles the Echidna