Fontanelle is a fictional mutant

Mutant (Marvel Comics)

In comic books published by Marvel Comics, a mutant is an organism who possesses a genetic trait called an X-gene that allows the mutant to naturally develop superhuman powers and abilities...

 character in the Marvel Comics

Marvel Comics

Marvel Worldwide, Inc., commonly referred to as Marvel Comics and formerly Marvel Publishing, Inc. and Marvel Comics Group, is an American company that publishes comic books and related media...

 Universe. Her first appearance was in Gambit

Gambit (comics)

Gambit is a fictional character, a Marvel Comics superhero that has been a member of the X-Men. Created by writer Chris Claremont and artist Jim Lee, the character first appeared briefly in Uncanny X-Men Annual #14 , weeks before a more comprehensive appearance in Uncanny X-Men #266...

 vol. 3 #1.

Fictional character biography

A mutant telepath of fair to high power, Fontanelle does her best work sifting through her subjects' dreams. Whether or not she is limited to that type of telepathic connection is still unclear.

Fontanelle was employed by the New Son to sift through the memories of people close to Gambit

Gambit (comics)

Gambit is a fictional character, a Marvel Comics superhero that has been a member of the X-Men. Created by writer Chris Claremont and artist Jim Lee, the character first appeared briefly in Uncanny X-Men Annual #14 , weeks before a more comprehensive appearance in Uncanny X-Men #266...

, mainly to determine his true role in the Mutant Massacre

Mutant Massacre

"Mutant Massacre" was a major Marvel Comics crossover storyline, which took place during the fall of 1986. It primarily involved the superhero teams the X-Men, X-Factor and the New Mutants...

. After the New Son terminated Fontanelle's services, she began to aid Gambit in piecing together the mysteries of both the New Son and the woman known as the Black Womb

Black Womb (comics)

Amanda Mueller is the great-great grandmother of Cyclops, Havok and Vulcan and the mother of Fontanelle. She first appeared in Gambit vol. 3 #4.-Fictional character biography:...

, who was Fontanelle's mother. As the Black Womb aka Amanda Mueller is the ancestress or great-great-grandmother of the X-Men Cyclops

Cyclops (comics)

Cyclops is a fictional character, the leader of the X-Men superhero team in the . A mutant, Cyclops emits a powerful energy beam from his eyes...

, Havok and Vulcan, Fontanelle is thus correspondingly their grand-grandaunt.

It is unknown if she still retains her mutant powers after M-Day.