Mibuna

is an Academy Student from Konohagakure.

Personality
Mibuna gets along well with her classmates Tsukune and Sansho. Like Naruto she is a troublemaker and likes to pull pranks. When Iruka initially questioned the group she feigned ignorance. However, she appears to have some sense of right and wrong as she and Sansho decided to run when Tsukune wanted to steal the Scroll of Seals. Mibuna got angry when Iruka suggested they enjoyed seeing Sadoru having a hard time. She also dislikes bugs.

Konoha Hiden: The Perfect Day for a Wedding
Mibuna, Sansho, and Tsukune perform some vandalism around the village. When Iruka catches them in the act, they claim to only be playing hide-and-seek, but he tricks them into confessing. Iruka remarks that Naruto Uzumaki was a much bigger delinquent when he was a student, which Mibuna and the others don't believe.

Trivia

 * Written as 壬生菜, "Mibuna" is a variety of wild mustard.