Biographical information
Physical description
Species Human
Gender Male
Skin color White
Eye color Blue
Personal information
Affiliation Trolls
Allies Shadow
Enemies Mario, Luigi
Weapon of choice Booze
Chronological information
First appearance Chapter 7
Status Dead

Kario is the father of Mario, Luigi, Wario, and Waluigi. He spends most of his days watching TV (Probably Nascar), drinking booze, and having sex with his mistress. Despite having lots of unprotected sex, the stork from Yoshi's Island apparently still brought in Mario and Luigi as babies. Kario told the stork to "dump them in the middle of nowhere so they would die". Kario is a member of the trolls, and at some point in his life was friends with Shadow the Hedgehog, presumably while Shadow was still with the trolls.

Mario and Luigi eventually come find Kario when they've grown up, with Kario explaining everything to them and laughing at them before slamming the door in their face. Mario murders Kario and his mistress in revenge before burning down Kario's home. Kario explains that he is a member of the trolls, fueling Mario's hatred for the Troll King.