They are parodies of ninja characters and ninja like characters specially mortal kombat characters, katana (dc) and psylocke (marvel) etc.

Daisy, Anne and Mei chain were born Deijī, An, mei kusari adopted by master senri nobuo at early age. He trained them in the ways of Muay Thai, Jin-jistu, judo, karate for years they trained, they reached teenage age they were pretty efficient but still learning but when there father died from a assassination they would adopt the name chain sisters begin to go hunting for the killer. This would lead to finding that the killer later known as ueno kan worked for the wicked mother, with this revelation they eventually would gain a acquaintance in powerf&@k and would join forces to help take down the wicked mother for the ordering of death senri nobuo.

Daisy chain (Deijī kusari) is the oldest of the sisters, is often associated with colour red. She disciplined mature and acts as mother figure to her sisters and is the leader of the sisters, she is known for loyalty, focus on duty, use of katanas and often struggles with keeping herself strong for her sisters. She was chosen to become the leader by Anne and Mei because of her responsibility, discipline, skills and age, she is very protective of her sisters willing to do anything for them taking care of them like a mother would. 

Anne chain (an kusari) is the second oldest sister, is often associated with the colour purple. She hot-headed, aggressive and rebellious, known for her temper and violence but underneath her tough exterior lies a fiercely loyal heart and deeply loves her sisters even is often fights with daisy. She very protective of Mei even if she occasionally picks on her, she often struggles with not being the leader but knows she wasn’t perfect fit because of her behaviour and eventually learns to accept it.

Mei chain (Mei kusari) is youngest sister, is often associated with the colour pink. She is energetic, aerobatic and often immature and is still learning, she often uses humour to lighten up serious situations which greatly annoys Anne but beneath her childish and immature personality is a loyal, creative and surprisingly intelligent woman. She is the team’s emotionl core, though she is sometimes distracted and native. She is a master with naginata but usually prefers not to fight, she embodies happiness and enthusiasm.