Luigi

The younger brother of Mario.

El Hermano De Bing
Mario's often overshadowed brother who only gets attention because he's related to the Mario.

Season 6
Unlike his brother, Luigi is cold and calculating in his approach, and rejects The Three Kings' ways, looking to join the faction of BANS Army instead.

Episode 9
Joins TFR Underground in hopes of reaching the higher ranks of the army.

Trivia

 * The L on his cap stands for "Legendary"