Jak is one of the main characters in the Jak and Daxter series, being a title and playable character in all games in the series (with the exception of Daxter (game)). From his debut in Jak and Daxter: The Precursor Legacy, he has undergone many changes in his body - both internal and external - and matured into a fully grown man, with a constant thirst for some action. He is the character the player controls the most throughout the series. It is interesting to note that unlike his best friend Daxter, he is the only major character not to have a major role in all of the games.