Serena Tsukino was just your average under-achieving junior high student - a crybaby, klutz, ditz, a snack-a-holic, and a girl who believed her best feature is her face... until one day she met a talking black cat with a crescent moon on its forehead. This cat was named Luna, and she gave Serena a special locket which would help her fight the evil forces threatening Earth. Once Serena transformed using this locket, she became Sailor Moon; a fighter of love and justice. Serena is lazy, loves to sleep and thinks that school should start at noon. She is a wimp and cries all the time, but when her friends are in danger or even the planet, a part of her is awakened that would do anything to keep the things she loves safe.

Becoming Sailor Moon has given Serena maturity, strength and the ability to later become the Queen of Crystal Tokyo (and the Earth) in the 30th Century. Serena's life all started 1,000 years ago when she lived in the Moon Kingdom as Princess Serena. After a vicious battle against the beings of the Negaverse, she was reborn into the present day to start with a new life, with normal parents and normal friends. Her true self sitting dormant inside her until awakened by the use of her locket and the Imperium Silver Crystal.