Ritsu is a character from the anime and manga series Assassination Classroom by Yusei Matsui.
She can make anything using the special plastic inside her, except weapons, as long as she has the data for the object.
She has a mobile version of herself called "Mobile Ritsu" that debuted in Chapter 28 of the manga and Episode 10. This version is loaded onto all of her classmates' phones and allows her to travel outside of her main unit. Her mobile capabilities are decreased, and can be hacked by skilled individuals.