Wu

According to this universe, Master Wu is the second son of the First Spinjitzu Master, Garmadon's younger brother, and Lloyd's uncle, also the son of the First Spinjitzu Master.

an elderly man with a long white beard. He usually wears a robe or kimono and a conical straw hat, under which his bald head is covered by a small black skullcap.

Master Wu is about a thousand years old.
Moral education of students. Wu not only trains ninjas physically, but also educates them morally, helping them overcome internal psychological barriers that prevent a person from achieving their goals. For example, the plot of the series plays on the theme of gaining the "true potential of a ninja."
Caution: Wu tries to plan and think it through in advance, unlike his brother Garmadon.
Worrying about students. When sending students into desperate situations, Wu always worries about them and, if possible, insures or covers the most vulnerable.
Strictness as a teacher. Wu is strict and demanding, because he understands that the lives of his students depend on the correct acquisition of knowledge.
Love to play tricks on others. For example, Wu says: "You are my best students, I believe in you!" - "Honestly, master?" - the students ask - "Of course not! I lied, you are all talentless, ha-ha-ha!"
Provoking his brother: Wu often distances himself from Garmadon, provokes him, and teases him, such as by making cat puns.