Loid Forger

Lloyd Folger (ロイド・フォルガー) is the protagonist and one of the three main characters of the SPY x FAMILY series. He discarded everything about his past to work for his country as an undercover spy who acts under the codename Twilight. For his next upcoming mission, he is required to marry and have a child, so he therefore enters a fake marriage with Yoru Briar and becomes the adoptive father of Anya Folger.

Description
Twilight discarded everything about his past in order to work for the country of Westalis in opposition to the country of Ostania. Hence, he has no real name. His newest and most important mission requires him to take out a politician who only comes out in public for his son's elite school reunions. And to infiltrate the school, Twilight has to marry and have a child. Twilight accepts this since the mission will benefit the whole world if it succeeds. He, therefore, adopts Anya and "marries" Yoru, while he legally adopts the name "Lloyd Folger" and changes his occupation to a psychiatrist.