Personality: Monet believes in herself so greatly that she comes across as self-absorbed and stuck up. Her superiority complex often puts her at odd with the other students.

Strength: Superhuman Class 10 (at least)

Known superhuman powers: M possesses various superhuman powers including superhuman strength, the ability to fly, telepathic powers (whose range is limited, though those limits have not been specifically defined), and superhumanly acute night vision. She also possesses extraordinary intelligence, although it is unclear whether it reaches superhuman levels.

Other abilities: Due to her extraordinarily high intelligence, M is an excellent scholar.

M, also known as Monet St. Croix, is a teenage Algerian who lived in Monaco and is the daughter of Cartier St. Croix, the wealthy former president of several corporations.

Monet first came in contact with many of her future classmates at Xavier's School when she and they were captured by the alien techno-organic race known as the Phalanx. Following the defeat of the Phalanx, Professor Charles Xavier, founder of the X-Men, decided to see to it that M and her fellow teenage mutant captives were instructed in the uses of their powers. Therefore, he invited them to become students at his school.

As time passed there was a series of surprising revelations about the usually aloof M. It turned out that the silent aborigine mutant Gateway had been her mentor. It was revealed that one of the X-Men's most implacable enemy, Emplate, was actually her brother Mariu. Oddly, she would at times go into an autistic state when she engaged in intense thought, and at other times she would shift from her usual mature, sophisticated personality into a childlike one.

It remains to be seen what are the causes of these personality shifts.