Why: Raised as the illegitimate son of Eddard Stark, Jon rises to become Lord Commander of the Night's Watch and plays a crucial role in the battle against the White Walkers.
Why: The illegitimate son of Roose Bolton, Ramsay is known for his cruelty and ambition, eventually legitimized and becoming the Lord of Winterfell.
Why: An unacknowledged illegitimate son of King Robert Baratheon, Gendry survives numerous challenges and is eventually legitimized as Lord of Storm's End.
Why: In Arthurian legend, Mordred is the illegitimate son of King Arthur and his half-sister Morgause, ultimately leading to Arthur's downfall.
Why: In Shakespeare's "King Lear," Edmund is the illegitimate son of the Earl of Gloucester, who schemes to usurp his legitimate brother's inheritance.
Why: Protagonist of Robin Hobb's "Farseer Trilogy," Fitz is the illegitimate son of Prince Chivalry, trained as an assassin to serve the kingdom.
Why: In Shakespeare's "King John," Philip is the illegitimate son of Richard the Lionheart, known for his sharp wit and loyalty.
Why: The son of Bruce Wayne and Talia al Ghul, Damian is raised by the League of Assassins before becoming Robin in the Batman series.