Bleu

Bleu is a member of the Gallia Knight Army, and brother to Damien, Jack and Janette. He is capable of leaping great distances and performing impressive acrobatic moves. Just like his older brother Jack, Bleu is a capable fighter and strong with a sword. He's seen taking down two royal guards with one swipe.

After stealing the Founder's Round Mirror, Bleu handed it over to Joseph, King of Galia, still sour about his brother being arrested he is happy to fight Saito in order to allow his sister to capture Louise.

There is some speculation about his name, Jack referred to him as Bleu, but Janette referred to him as Lulou, though regarding Jack's serious nature and Janette's rather carefree one, it is likely Lulou is just a nickname.

In season 4 they are hired by Tabitha to help in the battle with the Large Dragon at the school. They help setup a shield around the school.