This papercraft is Stitch's Ray Gun, from the game series Kingdom Hearts, the paper model created by tektonten. Stitch (aka Experiment 626) is a minor character in Kingdom Hearts II and Kingdom Hearts Birth by Sleep. He was originally found in Deep Space on a prison ship, where he allied with Terra, Ventus, and Aqua as a party member and Dimension Link, but eventually escaped and made his way to Radiant Garden, where he fought alongside Sora and his friends in the Battle of the 1000 Heartless. Afterward, he joined them as a Summon. He originated in the Disney film Lilo & Stitch.
You can download the papercraft model template here: Kingdom Hearts - Stitch's Ray Gun Free Papercraft Download