Otone Oto is an UTAU that you can use to practice otoing. She is also named Jikkenko (実験子) which means "Experiment Girl/Child." She is very lonely and desolate. She is very anxious.

Otone Oto's item is a bazooka. She hates Kokeshi dolls and loves barley. Her eyes are always 3/4 open.

Her name in Japanese is 韻音響. She was voiced by a text to speech site. It was using Ondoku3.com, and used a pitched up ななみ. 

Jikkenko's birthday is on January 28. Jikkenko wants to be like Uta Utane, and she is her idol.