Ronin Kognito[1] is a morally ambiguous yet skilled thief and a bounty hunter. Formerly based in Stiix with his airship R.E.X., Ronin made many mistakes; he made deals with the Soul Archer, and even "sold" Zane to Master Chen. However, looking to change his ways, Ronin sided with the ninja and oversaw Nya as she tried to master her Element. Morro forced Ronin to steal the Sword of Sanctuary, and lead the ninja into a trap. They made amends, and Ronin helped them fight the Preeminent and the Ghost Warriors in Stiix.
After the ghost invasion, the Police Commissioner hired Ronin to capture the ninja due to crimes they allegedly committed, and he agreed (at least partly because of the money) though they were framed. When the conflict with the Sky Pirates escalated, Ronin joined Jay's rag-tag team and raided Djinjago. Due to Jay's final wish, recent events were undone and Ronin never captured the ninja or joined Jay's team.
On the Day of the Departed, Ronin built himself a new mech and used it to help Jay defeat a resurrected Samukai.
Sometime in-between the Day of the Departed and the return of Acronix, Ronin opened up another pawn shop in Ninjago City and broke his leg while aiding the ninja in the fight against the Time Twins and their Vermillion army.
During Lord Garmadon's reign, Ronin was arrested and imprisoned in Kryptarium Prison. After he and members of the Resistance broke free, they helped defeat the Colossus and the Sons of Garmadon.
After the prisoners escaped from Kryptarium Prison, he was hired by Ninjago Police to catch all the escaped prisoners. However, when he learned of the uncharted island, he employed all the remaining prisoners and, with the help of the fake Wojira, robbed the Keepers, who gave him their valuables believing that the fake Wojira was real and was going to punish them. When he was exposed and defeated by the ninja, he remained imprisoned on the island in the Keepers' prison, along with other prisoners that worked for Ronin.
After Nya's sacrifice to defeat Kalmaar and Wojira, he attended her memorial.
Over a year later, he confronted the ninja in Kryptarium Prison and prepared to challenge them before being interrupted by guards. Upon seeing the ninja fight against the crystal army however, Ronin recruited Ultra Violet, Killow and Fugi-Dove to help them, effectively redeeming himself and becoming an ally once more.
