Nicole, Pia and Balu
From the Super Mario Wiki
Nicole, Pia and Balu are women appearing exclusively in the Club Nintendo comic "Sag niemals Holerö!". Mario, TicToc and Bomberman stumble across them in Frankfurt while searching for KKDU, an evil alien turning all human beings into food by singing a magical song called "Holerö".
The women come to Mario and his friends' attention because they are not transformed into food yet. Glad about this encounter, they decide to have dinner together. Balu attempts to use the jukebox, and Pia asks for their "favorite song". Bomberman sees through their plans and throws a bomb at the women. Obviously, they were subworkers of KKDU who attempted to play the "Holerö" song and thus turn the friends into food as well.
Nicole has short black hair, and is wearing a light blue blouse, black-and-white striped trousers and a green handbag. Pia has short brown hair and is wearing a dark top, brown trousers and a red handbag. Balu is wearing a yellow dress, dark trousers and has long black hair and a pink handbag.