*Princess Sonia Acorn is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. She is the daughter of King Sonic and Queen Sally, and sister of Prince Manik Acorn. Sonia greatly resembles her mother, but inherits her father's super speed and eye color. 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. She was shown to be fond of Tails upon his departure for Downunda, unsurprising given his history with her parents. Along with the rest of her family she came to Angel Island to visit the family of her best friend, Lara-Su. She and a group of other girls soon enjoyed a sleepover, which Manik of course intruded upon.[1] (StH: #137, #138, #139)

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...[2] (StH: #166, #167)

The M:25YL Sonia is very mature and assertive 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. Despite this, the two both enjoy making trouble, especially with Lara-Su, whom both adore despite the near 20-year age gap between them. Sonia is also strong-willed and dislikes the idea of anyone invading her home. Given her mother's efforts to avoid using the words "panic room" to describe their safe destination, it seems that Sonia is also highly excitable.*