Sensei Yang

Yang is Zachary Delightful's former nemesis and current ally. He is the creator of Airjitzu and used to work for The Departed as the best of the best. He is currently a defector, leaving the Departed for good, showing that there is good in him. Presumably, he is hiding out with the Myles Bots.

Childhood
Coming soon...

Pre-The High School Revolution
He was the best of the best of the Departed (an organization consisting of spirits and resurrected villains) and served as Ghost Captain's second-in command. Though well-known, Yang's time would come following the High School Revolution.

Post-The High School Revolution
Unfortunately for the villains, the Departed loses a still living agent twice thanks to Zachary. The adolescent is labeled by the Departed as a threat to their intentions so they sent Yang after Zachary which prompts the start of the rivalry sparking between them.

Fighting the Adolescent
Manipulation is what exactly makes Yang the main antagonist in the In Too Deep arc Possession. The ghost tries in vain to do anything it takes to frame Zachary such as turning the Snatcher against the teenager. He tries to avoid confrontation but his forming the Group was the last straw and he decides to fight them and almost succeeds due to his being the most powerful antagonist.

First Defeat
But luckily, Zachary unlocks more elements of his powers and fights the deadly spirit with the help of the Group. With Yang at his mercy, Zachary decides to hang him out to dry therefore he is overwhelmed by the heat and perishes in a fiery explosion. Despite suffering a complete defeat at the hands of Zachary, he still lives to tell the tale as his type of ghost can't be destroyed by fire.

Close the Circle
Unfortunately for Zachary, he sees that Yang is still alive but he only appears to tell the adolescent to "close the circle". Also, Johnny Johnny is sent in to have Zachary executed but he is immediately destroyed.

Here's Johnny
Ghost Captain, Fountain, Turtle Bandana and Johnny Johnny have realized that, contrary to what everyone thought, Yang survived and, with Ghost Captain and Johnny Johnny escaping the scene, reveals his true form. He then is forced to join Zachary, Fountain and Turtle Bandana in the next episode.