Sen

is a kunoichi of Sunagakure and a team-mate of Shira and Yome.

Naruto's Back: Friends' Tracks
Sen and her team arrive in Konohagakure to partake in the Chūnin Exams. For the first phase of the exams, Sen was placed separately in another room from her other team-mates. Her team was able to qualify for the second round. A preliminary round had to be held to lessen the many participants there were. The preliminary round involved a race to Sunagakure with only the first 30 participants qualifying for the primary second round. Sen and her team were of the 30 participants to make it. The next day, the second exam proctor — Temari, announced the start of the second round taken place within Demon Desert.