Which Marvel Comics character with severe mental illnesses appear in the pilot episode of the American cable television series named after the character?
Legion
Title: Ang Panday (2005 TV series)
Passage: Ang Panday or simply Panday (lit.  "The Blacksmith") is a fantasy television series that was aired in the Philippines by ABS-CBN.  The pilot episode of the first book ("Panday: Unang Yugto") aired on November 7, 2005 replacing "Ikaw ang Lahat sa Akin" and ended with its last episode on December 9, 2005.  The second book ("Panday: Ang Ikalawang Yugto") aired its pilot episode on April 3, 2006 and ended with the series finale on May 26, 2006.  The series is based on the fictional comics character of the same name, which was created by Carlo J. Caparas and illustrated by Steve Gan.
Title: Chapter 1 (Legion)
Passage: "Chapter 1" is the pilot episode of the American cable television series "Legion", based on the Marvel Comics character David Haller.  The episode is connected to the "X-Men" film series, the first television episode to do so, and follows Haller, who believes himself to be schizophrenic until he is interrogated by government agents who think he may be the most powerful mutant discovered.  The episode was written and directed by Noah Hawley.
Title: Legion (Marvel Comics)
Passage: Legion (David Charles Haller) is a fictional superhero appearing in American comic books published by Marvel Comics.  He is the mutant son of Professor Charles Xavier and Gabrielle Haller.  Legion takes the role of an antihero who has a severe mental illness including a form of dissociative identity disorder, in which each of his alternate personas controls one of his many superpowers.
Chapter 1 (Legion) Legion (Marvel Comics)