Stiles' life has become infinitely more complicated since "dying" as a surrogate sacrifice. Waking dreams and lost time caused him to believe he might be losing his mind. Stiles was, at one time, fully possessed by a Nogitsune but has fully recovered.
In the opening episode of Teen Wolf Season 6, Stiles sees the Ghost Riders and everyone forgets he existed. He is ultimately recovered, graduates high school, and leaves Beacon Hills to join an FBI internship in Virginia.
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