Ronin

Ronin is the former main antagonist of LEGO ninjago: shadow of ronin and a major character in ninjago: masters of spinjitzu, he is a selfish, yet skilled and intelligent mercenary. Based in Stiix with his airship R.E.X., he is hired often by Master Chen for important tasks such as capturing Zane and releasing the banished master from the Cursed Realm.

Up until the destruction of the Obsidian Glaive, Ronin was a memory thief known to remove people's memories and replace them with lies about their past.