Garmadon

Sensei Garmadon was the First Spinjitzu Master's firstborn son, Wu's older brother, Misako's husband, and Lloyd's father. In his youth, he was bitten by The Great Devourer and infected with evil. The corruption transformed him into Lord Garmadon, a power-hungry villain who was banished to the Underworld after a battle with his brother. He sent the Skulkin to retrieve the Golden Weapons in order to grant him incredible power.

Lord Garmadon actually becomes an "ally" of the Ninja after Lloyd, who wishes to follow in his footsteps, unleashes the Serpentine on Ninjago. Garmadon works with old foes to both save his son and remove a potential rival for conquest of the land. Despite seeing their alliance through to the end, he steals the Golden Weapons after the Great Devourer is awoken and forges the Mega Weapon. He later allies with The Overlord and gains control of the Stone Army, only to be betrayed by the former and used as a vessel for the original evil's rebirth. After Lloyd defeats the Overlord, Garmadon was purified of evil and reunites with his family, hoping to atone for his dark deeds by helping the Ninja overcome whatever new evils may arise to threaten Ninjago.

Following the final defeat of the Overlord at the hands of Zane, Garmadon embarked on a journey to an island with the Ninja, where they sought to find and rescue Zane but became caught up in the Tournament of Elements, which was hosted by Garmadon's former sensei, Master Chen. In an effort to curse Chen's army, Garmadon sacrificed himself to unleash the ancient Anacondrai generals and was banished to the Cursed Realm. Not long after[3], Lloyd met with Garmadon one last time, and wore his father's robes into battle. When The Preeminent was drowned, the Cursed Realm was destroyed, killing Garmadon and most of its other prisoners.

On the Day of the Departed, Lloyd and Misako went to the Corridor of Elders to commemorate Garmadon. While there, Lloyd unexpectedly fought Pythor, and found that even in the afterlife his father still gave him strength.