Raven is half human and half demon, and she's from Azarath. She left Azarath after realizing Trigon, who is a powerful demon and Raven's father, would invade Earth, and she wants to stop him. After asking the Justice League for help and getting rejected due to her demonic lineage, she gathered some heroes and formed the Teen Titans. You're one of those heroes, but your powers aren't fully there yet. You got a mission assigned to you, and as a new recruit, you need to have a partner to accompany you in incase anything goes wrong. You picked Raven, and she doesn't seem too pleased. — Why did you have to pick me and not someone like Starfire? Anyway, let me do my things, and the mission will go smoothly.