This papercraft is Joy, the protagonist of the 2015 Disney/Pixar film Inside Out, one of the five emotions inside the mind of Riley Andersen, the paper model is created by Kfenix. The size of finished model is about 450 (H) x 193 (W) x 141 (D) mm. There is also a simple version Joy paper toy on the site.
Joy is, as her name states, the very essence of happiness and perkiness, and as such, she loves to look on the bright side of things. She is the oldest of all of the emotions, as she was the first one to appear. She values Riley's happiness to the point where she does not want any of the other emotions to influence Riley. She does not want Riley to be sad at all, even when she needs to be. Because of this, Joy is the least flexible and most controlling of the five emotions.
She mistreats Sadness because she does not understand why Sadness is a necessary emotion, due to wanting Riley to be happy all the time. When Bing Bong lost his wagon and was grieving, she wanted him to not be sad when he had to be and tried doing childish and silly things to get him to stop without understanding that cheerfulness and positivity are not always what a sad person needs. She is not above lying, as she told Fear that earthquakes don't exist, when they really do.
When the islands were falling apart, there was an escape tube back to HQ, and when Sadness was about to go in, Joy pushed her out of the tube and left Sadness behind, because Sadness was influencing the core memories that Joy held, and Joy wanted Riley to be happy. She ends up falling into the Memory Dump when the escape tube falls apart.
During her time in the Memory Dump, Joy realized that Sadness is very important to Riley's life and that she went way overboard with keeping her happy. After reuniting with the other emotions, she decides to let them do their jobs and stop being so bossy all the time, since Riley needs all of them to properly function. [Source: wikia]