Full Name Sofia the 1st
First Appearance (Barney and the Rocko Squad) A Time of Sharing
Barney and the Rocko Squad Portrayer Ariel Winter
"You've come to the right castle!"
— Sofia the 1st, during the events of Sofia the First: Once Upon a Princess.

Sofia the 1st is a sweet and adorable young girl of humble origins who lives with the Rocko Squad during the events of Barney and the Rocko Squad. Like Alisa Bosconovitch, Ling Xiaoyu, and many other female characters in the Rocko franchise, Sofia possesses a sleeping habit.

In the ninth Barney and the Rocko Squad episode, which is called A Time of Sharing, Sofia the 1st wrote this letter to Alisa Bosconovitch:

  • Dear Alisa Bosconovitch,
  • I am going to come to Rockoland for a visit.
  • There's something else I want you to know.
  • Be aware of my sleeping habit,
  • for I will fall asleep many times when I come over.
  • Sofia the 1st

Ariel Winter, who previously voiced Sofia in Once Upon a Princess and its 2013 television adaptation, voices Sofia again during Barney and the Rocko Squad.