Mamar is one of the seven Star Spirits in Paper Mario. Because of her kind-hearted and happy nature, she looks after the six other Star Spirits. She is the Star Spirit Tutankoopa guards in Chapter 2: The Mystery of Dry, Dry Ruins. When Mario frees Mamar from Tutankoopa, she gives him the ability to use Lullaby. Lullaby acts similar to the Sleepy Sheep, with Mamar coming into battle and singing a song to put the enemies to sleep. The move requires one Star Power to use. She later appears along with the rest of the Star Spirits in Star Haven when they give Mario the Star Beam.
In Mario Party 5, Mamar is the guide of bonus mode. She is the only Star Spirit that appears on the box art.
"Advice From The Star Spirits" Entry
Mamar's Hint: Visit Merlon when you don't know what else to do.
"Mario, dear. If you ever get to a point where you simply don't know what to do or where to go, visit Merlon in Toad Town. Merlon is a fortune teller, and I'm sure he can foretell what you are supposed to do. Just remember that it costs money to have your fortune told. There are lots of nice people who will give you good advice, too, so be polite and take the time to talk to everyone you meet."
Merlon won't tell you exactly what to do, but what he does tell you should be helpful.