"That's not my little girl. It's some other...thing. My Sophia was alone in the woods. All this time, I thought. She didn't cry herself to sleep. She didn't go hungry. She didn't try to find her way back. Sophia died a long time ago". ~Carol talking to Daryl about Sophia as a walker.

Sophia Peletier is the daughter of Ed and Carol. During the initial outbreak, Carol, Ed and Sophia evacuated to Atlanta for safety, but end up joining a camp of survivors. While at the camp, Sophia sparked up a friendship with Carl Grimes and Eliza Morales.

Before the outbreak, when she was a baby, Sophia used to wake up at 3:00 a.m causing her father to get annoyed by it, and stay with a friend until she calmed down, indicating that he did not care much for her. It is possible that she was a victim of abuse from her father, since he was abusive towards her mother. Carol has also hinted at potential abuse while she is praying in the church, stating that Ed "looked at her with whatever sickness was inside of him". During the outbreak, she meets Shane, Lori, and Carl as evacuations are being made for survivors to head towards Atlanta. With the city being destroyed by the military, she, along with her family, decide to stay with Shane, Lori, and Carl.

Shortly after Rick arrives he and the group decide to more. They hit the road but eventually are stopped by a pile up of cars on the road. While searching for anything they may be able to use a horde of Walkers are seen heading their way. Everyone hides in time however Sophia leaves her hiding spot to soon and runs off into the woods. Rick chases after get and finds her quickly but is forced to have her hide so he can take out the two Walkers chasing after them. When he returns she's gone. The group searches for her until Carl is shot and they are forced to relocate to the camp. Rick stays by Carl's side while other members continue to look with no luck. Unfortunately she is eventually found in Hershel's barn.

Sophia was a shy, quiet young girl. She was not known enough by people to know her true personality, it is assumed she was really nice, as stated by Carol in "The Grove", who said that " she (Sophia) didn't have a mean bone in her body". It can also be said that she was good at making friends as she was close to Eliza Morales and Carl Grimes, who seemed to care about her deeply.