Answer the question at the end by quoting:

Thierry Daniel Henry (French pronunciation:  [tjeRi aRi]; born 17 August 1977) is a retired French professional footballer who played as a forward and is the second assistant manager of the Belgium national team. He played for Monaco, Juventus, Barcelona, New York Red Bulls and spent eight years at Arsenal where he is the club's all-time record goalscorer. At international level he represented France and is his country's record goalscorer. Henry made his professional debut with Monaco in 1994.
In 1990, Monaco sent scout Arnold Catalano to watch Henry, then at the age of 13 in a match. Henry scored all six goals as his side won 6-0. Catalano asked him to join Monaco without even attending a trial first. Catalano requested that Henry complete a course at the elite Clairefontaine academy, and despite the director's reluctance to admit Henry due to his poor school results, he was allowed to complete the course and joined Arsene Wenger's Monaco as a youth player. Subsequently, Henry signed professional forms with Monaco, and made his professional debut on 31 August 1994, in a 2-0 loss against Nice. Although Wenger suspected that Henry should be deployed as a striker, he put Henry on the left wing because he believed that his pace, natural ball control and skill would be more effective against full backs than centre-backs.  After a tentative start to his Monaco career, Henry was named the French Young Footballer of the Year in 1996, and in the 1996-97 season, his solid performances helped the club win the Ligue 1 title. During the 1997-98 season, he was instrumental in leading his club to the UEFA Champions League semi-final, setting a French record by scoring seven goals in the competition. By his third season, he had received his first cap for the national team, and was part of the winning team in the 1998 FIFA World Cup. He continued to impress at his tenure with Monaco, and in his five seasons with the French club, the young winger scored 20 league goals in 105 appearances.  Henry left Monaco in January 1999, one year before his intimate and closest teammate David Trezeguet, and moved to Italian club Juventus for PS10.5 million. He played on the wing, but he was ineffective against the defensive discipline exhibited by teams in Serie A, struggling in a position that was uncharacteristic for him, scoring just three goals in 16 appearances.

Whom did he play against while at Juventus?

but he was ineffective against the defensive discipline exhibited by teams in Serie A,

IN: 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. The television series Legion premiered on FX network in 2017.

Charles Xavier met Gabrielle Haller while he was working in an Israeli psychiatric facility where she was one of his patients. Xavier was secretly using his psychic powers to ease the pain of Holocaust survivors institutionalized there. The two had an affair that resulted in the birth of their son David. Xavier was initially unaware of this, as Gabrielle never told him she was pregnant.  When he was very young, David was among the victims of a terrorist attack, in which he was the only survivor. The trauma of the situation caused David to manifest his mutant powers, incinerating the minds of the terrorists. In the process, he absorbed the mind of the terrorist leader, Jemail Karami, into his own. Being linked to so many others at their time of death, he was rendered catatonic, and remained in the care of Moira MacTaggert at the Muir Island mutant research facility. The trauma caused David's personality to splinter, with each of the personalities controlling a different aspect of his psionic power.  Karami struggled for years to separate his consciousness from David's. Using David's telepathic abilities, he reintegrated the multiple personalities into David's core personality. Some of the personalities resisted Karami, and two proved to be formidable opponents: Jack Wayne, a swaggering adventurer, who commands David's telekinetic power, and Cyndi, a temperamental, rebellious girl who controls David's pyrokinetic power. Wayne intended to destroy Karami's consciousness to preserve his own independent existence within David's mind. Neither personality succeeds, and Karami, Wayne, and Cyndi continue as David's dominant personalities.  During his time at Muir Island, David emerged from his catatonia. Soon after, David was possessed by the Shadow King, who used his powers to psychically increase the amount of hatred in the world and feed on the malignant energy. During this time, the Shadow King, as David, killed the mutant Destiny. The X-Men and X-Factor fought the Shadow King, and as a result, David was left in a coma.

what was the fictional character?

OUT:
The two had an affair that resulted in the birth of their son David. Xavier was initially unaware of this, as Gabrielle never told him she was pregnant.