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Her first appearance was in Super Pokemans 64: Legendary Pokemon although it was a cameo.
Her first major appearance is in SM64 Bloopers: Luigi Labyrinth where she was created by a cloning machine when SMG4 stepped into it. However, it was actually being used to clone Mario's spaghetti. SMG4 stopped it due to what he deemed was a time waster but Mario hated it and pushed him inside, causing his DNA and traces of the spaghetti's DNA to be fused, creating her. This might also explain her occasional retardness.
Since she was made with SMG4's DNA, she is his sister. Being female though means the mustache used on her model is actually a fake.
Minion acts rather stupid at times, perhaps to Mario’s level. However, she has had some outright moments of genius at times such as in her major debut episode where she once played music to distract an army of Luigi Dolls. She is extremely flamboyant and likes to show off.
Minion has a love for things that seem cute and harmless to her. In SM64 Bloopers: Luigi Labyrinth, she wanted to hug a Luigi Doll, due to thinking that it was "cute." In the ending, she opens up a new store called The Luigi Doll Shop and asks if anyone wants to buy a Luigi, but Mario doesn't let anyone buy the REAL Luigi, instead deciding to throw him around.