Rika was born to a rich family, as the only child of two pretty neglectful parents. She kept a perfect grade, socialized well with other rich kids, and tried her best to make her parents proud, to get even a shred of attention or acknowledgement from them. When she was 13, she met a girl who she began dating. Her parents were unaware of this, and thought the girl coming over all the time meant that they were good friends. Eventually, Rika came out as bisexual to her parents and they were.. disgusted. They disowned her immediately. When Rika turned to her girlfriend, she found out that she was being used for her money, and they broke up. Rika lived at a homeless shelter and eventually befriended Ned, moving in with him. They aren't romantically involved.
Ned was adopted as a small child by a couple that couldn't have their own kids. His family was very loving and supportive. He moved out at the age of 16 after he graduated from school early, and got a fairly well-paying job to rent a house. He met Rika and Alain later on and they moved in.