Gigi and Merri, also known as the Jellyfish Sisters, are minor characters that appear in the game Mario & Luigi: Superstar Saga. They are users of the Firebrand and Thunderhand techniques and helps Mario and Luigi further the use of the techniques after finding out that they are also users of the techniques. They run a hand massage shop on Gwarhar Lagoon.
Gigi is the oldest of the two sisters. She will teach Mario how to use the Firebrand technique on Luigi. Gigi demonstrates this technique on Merri on how this new technique makes the duo run faster. Gigi then tells Mario and Luigi to use that technique to retrieve the red pearl for her. They do so and she is excited.
Her outfit is a red dress that covers her entire lower body. She is quite tall, about double Luigi's height, making her as tall as Merri is.
Merri is the youngest of the two sisters. She will teach Luigi how to use the Thunderhand technique on Mario. Merri demonstrates this technique on Gigi on how this new technique makes the duo walk together at the same time in the same sequence. Merri then tells Luigi and Mario to retrieve the green pearl for her. They do so and she is excited.
Her outfit is a green dress that covers her entire lower body. She is double Luigi's height, which makes her as tall as Gigi.