Dareth Brown (also known as Grand Sensei Dareth or the Brown Ninja) is a laid-back and self-proclaimed karate master who owns Laughy's. He has always wanted to be like the ninja and hoped that he might acquire an elemental power one day. He once owned a small dojo called "Grand Sensei Dareth's Mojo Dojo," where he taught a group of students. He came into contact with the ninja during their attempts to train Lloyd and became something of a friend and ally, despite his lacking skills; when the Stone Army arrived in Ninjago City with the Overlord, Dareth claimed the Helmet of Shadows and gained control of the Stone Army, which he used to fight against a corrupted Nya and would later rejoice with the ninja after the battle. Months later, when the Nindroid crisis began, Dareth helped manage the students at Wu's Academy.
After Zane met his supposed end, Dareth accompanied Nya as she journeyed off to Chen's Island to find the ninja. While there, Dareth dealt with Chen's cultists, eventually allying with the ninja in their battle at the Corridor of Elders. After the ninja saved Stiix, their popularity grew, and Dareth tried sustaining their fame while creating his TV studio. However, the arrival of the Sky Pirates put the city at risk. Dareth would later join Jay's rag-tag team as they sneaked into Djinjago. Following Jay's final wish, the team was never created, and Dareth lost his memories from Ninjago's experience with the Sky Pirates.
On the Day of the Departed, Dareth hosted a concert outside the Ninjago Museum of History. While there, Cole accidentally revived the ninja's old enemies, including Kozu, who sought revenge on Dareth alongside several Stone Warriors. The villains attacked Dareth, prompting him to run inside the museum and retrieve the Helmet of Shadows. Once again, Dareth used the helmet to control the Stone Warriors, commanding them to destroy Kozu. Following the ordeal, Dareth reconvened with Cole and the other ninja at the Temple of Airjitzu.
During Lord Garmadon's takeover of Ninjago City, Dareth joined the Resistance under the command of Lloyd and Nya. However, due to his lack of powers, he felt that he couldn't contribute to the cause. He gains "powers" from Mystake and is among the few to escape the Sons of Garmadon, who captured and subsequently imprisoned the rest of the resistance. Dareth continues to help Lloyd, Nya, and Skylor in fighting Garmadon's oppressive rule. Eventually, the ninja returned, and Lord Garmadon is defeated. Dareth is invited into the stage by the ninja to be hailed as a hero of Ninjago.
During the Great Flood, Dareth helped to rescue citizens on a tour bus with the assistance of Jay. One year after the Great Flood, Dareth started to take lessons in the law and eventually became the ninja's lawyer. After the ninja had been imprisoned in Kryptarium Prison, he helped them to escape from prison. Later Dareth helped the ninja to defeat the crystal army and brought the ninja their allies to help rebuild the Monastery.
Years after the Merge, Dareth would stumble upon New Djinjago, where he wished to Arrakore to make him a ninja permanently, only for the latter to unamusedly reject his wish.
