Raven is a half-demon, half-human hybrid. She is one of the most mysterious characters throughout the series. She is quiet, emotionless, studious, and sarcastic. She can always come up with a witty remark, specifically in reply to most of Teen Titans' antics and attempts at humor. Her appearance and attitude appears to be that of a typical modern goth female. She's a recluse and sort of to herself. Robin also said that she is "the most hopeful person he has ever known." Raven is often portrayed as the most mature member of the group, often giving her own advice to the others about various subjects, and generally staying cool and calm, even in desperate situations. She is, however, also the most emotionally-restrained of the Titans, appearing secretive and distant; she initially does not allow any of her fellow Titans into her room and spends most of her time by herself, usually meditating or reading one of her numerous books. The reason for her emotional restraint is due to the adverse effects her emotions have on her powers. If her emotions become out of control, her powers can become erratic and spontaneous, becoming active without her will. In the course of the series, however, she gradually, if only slightly, seems to warm up to her teammates. As shown through her quick suspicion of Terra, it is difficult for Raven to build trust for anyone, and even more difficult to truly forgive if that trust was to be broken.