Tei is introduced as a yandere, someone who appears to be loving at first but can get very violent for whatever reason; In her case, she'll get violent because of someone touching Len (her crush). She is always trying to kill Miku in order to take over the leading Vocaloid/Utauloid status. She despises the Vocaloids with a passion, and has an odd fetish for traffic lights. She's not ashamed to masturbate in public if the urge rises. As for her normal traits, she likes baking a cake.