Stiles' personality is most accurately described as anxious, hyperactive, and curious. He is a notorious bookworm who excels at piecing together clues and figuring out mysteries, such as the fact that Scott had become a Werewolf, the identity of the Kanima's first master, and the fact that a Dark Druid was behind the human sacrifices that were occurring in Beacon Hills. Since becoming aware of the supernatural world, Stiles' social and generalized anxiety has only become worse, because he fears having to deal with the loss of any more of his friends or family as a result of their supernatural enemies. Because of this anxiety, Stiles can often become so overwhelmed by trauma that he both physically and verbally lashes out at those around him.
Despite Stiles' anxiety and his increasingly violent reactions to bad news, Stiles is a very loyal person who would do anything to protect his loved ones, even if it means giving up his life to do so. This has only increased since he was possessed by the Nogitsune, because the amount of enjoyment that he got out of being powerful and in control made him frightened and ashamed of his darker nature, pushing him to do good to make up for it and to ensure that no one else gets hurt because of his actions. Stiles is slow to trust people, but once he warms up to them and the person gains his trust, he becomes very close to them and will do whatever he has to do in order to protect them and ensure their safety, as evidenced by his relationships.
