On 18 April 2008, Perfume made a special guest appearance performing "Ceramic Girl" at the ending of the drama Sumire 16 sai!!.

[4] On 23 March 2012, Perfume made a special guest appearance performing "Baby Cruising Love" in the movie Moteki.

[5] In 2014, Nishiwaki co-wrote the song "Sore o Tsuyosa to Yobitai" (それを強さと呼びたい, "I Want to Call That Strength") with Haruichi Shindo.

It was used as the theme of the Amuse Fes 2014 BB in Tsumagoi, and was performed by 13 artists: Perfume, Porno Graffitti, Flumpool, Begin, Skoop On Somebody, Yu Takahashi, Weaver, Mihiro, Monobright, Rihwa, Haku, Sakura Fujiwara, and Cross Gene.

[8] On 18 January 2017, Nishiwaki played the voice of an imaginative creature named Reba in the NTV drama Tokyo Tarareba Girls.

[13] In October 2020, Nishiwaki reprised her role as the voice of Reba in the special drama Tokyo Tarareba Girls 2020.