Barunya is a Mazin from the Mazica Party universe, visually defined by a unique fusion of balloon-like qualities and feline traits. This combination shapes its core design and thematic presence.

Barunya forms a contract with the human Kezuru after Kezuru activates a Mazica Gear during an attack by an airship-like creature. This partnership becomes central to their narrative journey. Together, they engage in card-based battles and confront various challenges.

In combat, Barunya utilizes balloon-themed abilities:
* **Cat Punch**: A basic punch attack harnessing balloon elasticity.
* **Screw Meow**: Creates a balloon infused with closed turbulence to strike opponents.
* **Gigant Cat Punch**: Gathers air into one arm to deliver a powerful punch.
Barunya undergoes significant evolution, achieving multiple advanced forms that unlock new techniques:
* **Fuclock Form**: Gains **Clock Up Meow**, an attack utilizing time-based mechanics.
* **Discou Form**: Uses **Mirror Ball Hammeow**, an ability involving reflective or disco ball-like properties.
* **Burn Ballonya**: Executes **Burn Cat Punch**, a fiery punch variant.
* **Crossburn Ballonya**: Accesses **Crossburn Cat Punch** (a dual-element punch), **Ball Ball Wave** (an energy wave), and **Jet Cat Punch** (a high-speed strike).
* **Bigburn Ballonya**: Performs **Bigburn Leo Punch** (a beast king-enhanced punch) and **Ball Balse** (a wave or field manipulation ability). This progression represents the most extensive form evolution among Mazins.

Barunya's relationship with Kezuru centers on their contractual partnership, focusing on collaborative battles and shared growth.

Trivia notes reveal its name blends "balloon" and the Japanese cat cry onomatopoeia "nyā". Two signature moves reference other franchises: **Screw Meow** alludes to the Rasengan technique from *Naruto*, while **Gigant Cat Punch** references Gomu Gomu no Gigant Pistol from *One Piece*, connections stemming from shared voice acting.