She is a hot-headed fighter in SMG4's Gang.

She was brought to life by Fishy Boopkins.

Just like her name (which was derived from Psycho) implies, Saiko was a psychotic yandere who caused death and destruction to everything she came across, which was one of her "ways" to get attention. Since her debut, Saiko started as a nice and friendly girl who loves to hang out with Boopkins. When someone started to making fun of her and anything close to Boopkins, she would destroy anything to get her way, thus leading Boopkins to dump her because of this reckless and violent behavior. Due to this, she became mentally unstable and even more egotistical for a while so everybody can notice her, however in Mario and the Bob Mansion, Saiko was answering a question to Boopkins if they are still friends with Saiko where Saiko replied saying they are still friends later on in the blooper.

(The "Language of a role that can be performed in" is very optional)