Bart L. Darlton is one of the members of the Glaston Knights. He has dark, greenish blue hair. Like the other members, he is also an adoptive son of Andreas Darlton.

Bart and the others make their first appearance in Episode 21, when they have just arrived in Area 11 from the mainland. He also contributes in defeating the Black Knights at the end of first season.

He first appears when zero makes his return along with the rest of the Glaston Knights. His last appearance was when Guilford announces that he will execute the members of the Black Knights. During the execution, Zero came and asks Guilford to fight one-on-one. However, Zero cheated, before the battle started; the floor collapsed underneath Guilford and his subordinates. This tactic is also used during the Black Rebellion. Thanks to it, Zero easily attacked Guilford and his comrades. Bart becomes angry at Zero and attacks him, but to no avail since Zero protects himself with the police's shields. Too focused on attacking Zero, Bart doesn't notice that the G-1 Mobile Base was falling down and going his way, realizing it was too late as both himself and his Gloucester are crushed.
(Source: Code Geass Wiki)