Niagara (Full name: Niagara Leera Matrix) (Japanese version ナイアガラ Naiagara) is an Aquos Bakugan of the Matrix Six, and is the main Aquos Bakugan of Matrix. She is also a Bakugan of both the Matrix Six and the Matrix Siblings.
In her human form, Niagara is a sweet and gentle being, and is kind to many others. In battle as a Bakugan, she takes the form of a large and horrid-looking fish-like monster with jet-black hair. Niagara possesses rows of sharp teeth, and has black eyes with red pupils, giving her an intimidating and a terrifying appearance.
Niagara is kind and gentle Bakugan, despite resembling a horrifying creature in her Bakugan form. She is cruel in battle, however, and does not show mercy, just like her older brother Simulacion, who she highly respects above all others, besides Matrix and the Matrix Six.