Princess Peach (Japanese: ピーチ姫, Pīchi-Hime) is the princess of the Mushroom Kingdom. Peach was created by Shigeru Miyamoto, and is the damsel-in-distress throughout most Mario games. Since her debut in Super Mario Bros., Peach has appeared in Mario games for over 20 years. Peach resides in her castle along with many Toads who tend to her. Her kingdom is often attacked by the Koopa Clan, lead by Bowser. Also,she is portrayed as Mario's love interest and the frequent damsel-in-distress. She also has a special relationship with Princess Daisy, and is a good friend of Birdo and Toadette.
Interactions with Peach and Birdo are seen in their team names in Mario Party 8, such as "Pink Superpowers". Soon after, the fireworks start in Mario Super Sluggers, and she is seen at the Mario Stadium with Birdo, where they enjoy the final explosion.
Prior to the events of Mario & Luigi: Superstar Saga, Peach was notified by the Beanbean Kingdom that the witch Cackletta would come and try to steal her voice. Cackletta wanted to do this in order to waken the Beanstar, a star-shaped bean which would grant wishes to everyone. The Beanstar has been sleeping and could only be wakened by a pure voice, in order to prevent abuse. Peach took precautions and when Cackletta and Fawful, dressed as ambassadors, arrived at her castle, they were not greeted by Peach, but by Birdo, who was disguised as the princess. Cackletta and Fawful unknowingly stole Birdo's voice and escaped from the castle, leaving her with a voice of exploding characters. However, Mario, Luigi and Bowser, who were not aware of the true identity of the "princess", followed Cackletta to the Beanbean Kingdom before the real Peach was able to intervene.
After Mario and Luigi had presumably killed Cackletta at the Woohoo Hooniversity, Peach went to the Beanbean Kingdom with her plane. Peach revealed Birdo's disguise, thanked Mario and Luigi for taking care of the Cackletta problem, and decided to spend the holidays in the Beanbean Kingdom. Later, Bowletta kidnapped Peach in order to make sure to awaken the Beanstar this time, which had shown angry reactions when confronted with Birdo's voice.
When Mario and Luigi met Bowletta in Joke's End, Luigi dressed himself up in Peach's spare dress to fool Bowletta and Fawful into thinking he was Peach. The plan worked, and Bowletta released the real Peach, and kidnapped Luigi instead. In the meantime, Mario received a kiss from Peach.