Sonia Acorn

Sonia Acorn is the daughter of King Sonic and Queen Sally, and sister of Prince Manik Acorn. Sonia bears great resemblance to her mother, though has inherited her father's super speed and eye colour. She is princess of the Kingdom of Acorn.

25 Years Later (Unaltered)
In the unaltered timeline, Sonia is the daughter and first-born child of King Sonic and Queen Sally, and elder sister of Manik Acorn.

25 Years Later (Altered)
Due to Sonic's travel to the past, Sonia was erased from the timeline, putting a mental toll on the former king. However, after Shadow's defeat, Sonic brought up the idea of kids to Sally...

Five Years Later...
Five years afterward, Sonia was yelling at her brother Manik to move so she can see the TV and herself on it. She complained when she learned that her parents were going out for the night, but quickly changed her mind when she found out Lara-Su was babysitting them. She later caused havoc with her brother Manik, forcing Lara-Su to use Chaos Control to rein them in. Lara-Su then put them to bed and read them a few bed time stories, which seemed to put them to sleep. However, the two quickly sneeked out of their room and caused more trouble, resulting in a pillow fight with Lara-Su. The next day, they attended the celebration of the Five Years of Peace, when a missile was suddenly launched at the royal family. However, they were saved by the timely arrival of Silver the Hedgehog.

Personality
The M:25YL Sonia is very mature and asseritce, and has slightly more tolerance for her royal duties than her brother, which includes frustration, than Manik, who as first-born male, is heir to the throne of Mobius. Sonia was also best friends with Lara-Su, the daughter of Knuckles, once stating to her she "would hate to lose you as a friend."

The M:30YL version of Sonia is very fun loving due to being a child, and also gets annoyed with her brother easily.