Master Wu's Academy

Darkley's School for Bad Boys' is the school where Lloyd attended, before being kicked out.

In The Show
When confronting Lloyd for the first time, they mention him attending this school. When Lloyd first meets Pythor, they talk about him being kicked out and then plot revenge on it....

Lloyd's Attack
During Lloyd's attack the students and teachers are tied up, and the place is rigged with traps.

Staff
Nuckal and Kruncha are seen as supply the faculty during Lloyd's attack.In The Online Video Game, Some skeleton were the new staff.

Student's
All the students wear identical outfits, so Darkley's is probably a uniform school.

Two of the students (the one with the brown Bieber-cut and Harry Potter face, and the one with the black hair beside him) also apear in Jamonacai Village during Lloyd and Pythor's attack, and their toy boats are wrecked.

They also appear at the Ninjago talent show.