Quario

Quario is the Fourth Dimensional counterpart of Mario.

Into the Fourth Dimension
He first appeared in Into the Fourth Dimension, where, while disabled, he helped Mario save the Fourth Dimension. However, when Mario was possessed by Dimentio, he, due to the Dimensional Similarity Theory, collapsed.

Super Mario 64: The Curse of the Invincibility Frames
Quario was saved by Mario. Quario also helped Mario out during his venture in Rainbow Rainmoon.

Back to the Fourth Dimension
He also helped out the heroes in Back to the Fourth Dimension.

Personality
He is like Mario, but is much more carefree. He is still adventurous, but a sense of caution lies within.

Counterparts

 * Mushroom Kingdom counterpart: Mario
 * Star World counterpart: Stario
 * Dimension X counterpart: Oiram