The sons of Iapetus were also described as possessing some of the worst of human traits:mostly on an intellectual level, Prometheus is overly sly and crafty, Epimetheus a guileless fool, Atlas overly daring, and arrogant Menoetius prone to rash and violent actions. Their natural traits led each to their downfall. Iapetus and his family were regarded as the ancestors of mankind, a race which inherited the worst qualities of these four sons: crafty scheming, foolish stupidity, excessive daring, and rash violence.
Second Titan WarEdit
He battled Percy Jackson, and Percy grabs Iapetus with the little remaining strength he had in his injured arm and pulled himself and Iapetus in the River Lethe, which makes you forget everything about yourself. When Iapetus came out, Percy convinced him that his name is "Bob" and that they are good friends. 'Bob' noticed Percy's wound from the Keres (daimones) and healed it with a touch.
Iapetus is later said to be given a job in the Underworld, for the good of the Olympians this time.
Iapetus, has gray hair that stick up in every direction, a scraggly beard, pure silver eyes, and is very thin and haggard.