All the 'Baby' characters.
The youngest Koopaling in the Mario franchise is Ludwig von Koopa. He is often depicted as the most intelligent and musically inclined of the siblings. Ludwig has a unique appearance, characterized by his blue hair and large, prominent teeth. In the series, he serves as a boss character in various games, showcasing his skills and abilities.
Teddy McNulty is the youngest of the McNulty boys.
tails
No there is no Mario character that starts with a J
the best character in Super Mario is cat Mario
Not counting the Chao, the youngest character would probably be Amy, who is 6 years old. One more edit on this will have to be a report.
Susie Swanson.
Mario :)
luigi and Mario . luigi and Mario . lugi and Mario.
Yes. Mario is a legend.
Mario.
Mario