Gokudera's exclusive Box Weapon created by remodeling a Storm-attribute Storm Cat. It is imbued with Vongola's latest technology. A part of the Sistema C.A.I., through Cambio Forma it changes into the shape of an archery-style weapon employed by the First Storm Guardian. The red arrow it releases boasts astonishing destructive power.
Uri has a mischievous nature and is constantly antagonizing Gokudera every chance it gets. After it was upgraded into a Vongola Box, the most distinct changes were an increase in size and the addition of a crest in its forehead and Storm Flames on its paws.
- Taienrankuga (Flame Storm Sky Fangs) - A combined attack with Kangaryu and Alfin. Kangaryu shoots Uri with a Sun Bullet to increase its size and strength, while Alfin combines its Rain Flames with Uri's Storm Flames for greater destructive power.
- Cambio Forma: G's Archery: By Cambio Forma, Uri combines with the Flame Arrow to create an ornamented, bone-like bow with Storm Flames covering the drawstring and a gauntlet with the Roman Numeral "I" in the middle. It can increase the user's Normal Storm Flames Uri remains sentient in this form and is able to assist Gokudera with his aiming.
- Uri's name means "Melon."
- Uri is the only Box Weapon shown consuming both Dying Will Flames and food.
- Uri seems to dislike the Storm Mink of the Varia Assassination Squad, the same way Gokudera dislikes Belphegor.
- Uri likes G. more than Gokudera, much to Gokudera's anger.