Sensei Wu

Background
Wu was a young boy living at the monastery his father and his brother Garmadon, who was his best friend. During one of their duels, Garmadon disarmed Wu's katana and accidentally flung it over the monastery walls, since their father would be upset about it, Garmadon asked for Wu to go and retrieve the sword, only for Wu to refuse and get chided by Garmadon for it, saying to Wu "Never put off for tomorrow, what could be done today." before hopping the wall to get back his brothers sword for him. Only for Garmadon to get bitten by The Great Devourer and infect him with its evil. Sensei Wu years later managed to defeat the self-appointed Lord Garmadon in a battle over the four golden weapons of Spinjitzu. After defeating his brother, Sensei Wu hid each of the weapons and had a dragon of the corresponding element guard each one. Sensei Wu holding the Sword of FirHe then created a map and gave it to Kai's Father to safe guard for him in case he died before the weapons required collecting. He can be harsh on his students but when it comes down to it Sensei Wu is just about the bravest warrior there is. He was defeated by Samukai who thus collected all four golden weapons creating a portal in Lord Garmadon's throne room. Garmadon escaped through the portal claiming that he would soon return.