Tatsu is seen as The Shredder's second-in-command and personally oversees the entire youth center for the recruitment of Foot soldiers, while his master is away attending to other matters. He is shown to have a short temper, often physically abusing and punishing the Foot clan for failure. He brutally injures and almost kills a young teenage Foot soldier named Shen So (originally it was intended for Shen So to die, in order to show the sheer brutality that existed within the Foot's ranks, but was cut and replaced with other dialogue: 'You'll be alright,' due to younger audience issues) for trying to calm Tatsu down and defend another Foot member. Tatsu is shown to be unwaveringly brutal in both teaching and combat, as Casey Jones discovers near the climax of the first film. However, Jones comes out the better man, as he wounds and knocks an unsuspecting Tatsu unconscious with a golf club. Following this, Tatsu's fate remains ambiguous until the sequel.
It is revealed that Tatsu escaped the Foot's original hideout at the end of the first film and meets up with the now vastly smaller Foot clan and proclaims himself their new leader, just as the recently-thought-deceased Shredder returns. Still second-in-command, Tatsu carries out the Shredder's first orders with ease; securing the TGRI canister and dispatching his best Foot ninja to follow April O'Neil. His role is fairly minor compared to the first movie, although he remains unwaveringly loyal to his master and rarely leaves his side. He expresses a certain amount of joy in the idea of 'properly disposing of' the two new mutants created by Professor Jordan Perry's ooze; Tokka and Rahzar. In the film's penultimate battle in a night club where Vanilla Ice is performing, Tatsu is 'shell attacked' by the 4 turtles and stumbles away, unconscious. What happened to him and the rest of the Foot clan following their defeat, is unknown.