Ra's al Ghul is a formidable and enigmatic villain in the Batman series, known for his vast intelligence, strategic acumen, and immortality, which he maintains through the use of the Lazarus Pit. As the leader of the League of Assassins, Ra's al Ghul poses a significant threat to Batman and Gotham City, seeking to impose his own form of justice by purging corruption and restoring environmental balance, albeit through often ruthless and extreme measures. His complex relationship with Batman, who he sees as a worthy successor, adds depth to his character.