Mento is the leader of the Doom Patrol and a minor character in Teen Titans. He is a superhero who is the husband of Elasti-Girl/Rita Farr and the adoptive father of Beast Boy. However, due to his bad treatment of his son, Beast Boy grew fed up with his adoptive father's harsh attitude and eventually left Doom Patrol.
History
Mento was born Steve Dayton and was a brilliant scientist who invented a helmet to enhance his mental abilities. He married Rita Farr/Elasti-Girl, and they founded the Doom Patrol with Larry Trainor/Negative Man and Clifford Steele/Robot Man. Soon, his team became mortal enemies with the Brotherhood of Evil led by The Brain, and his followers, General Immortus and Madame Rouge. One day, an orphaned child, Garfield Logan. He tried infiltrating the headquarters of the Doom Patrol, a team of superheroes he had a deep admiration for. However, the team had caught him trying to break into their privacy and set up traps for him to prevent Beast Boy from infiltrating it. Using his shape-shifting abilities, Garfield dodged the attacks by turning into animals that could evade the traps. Impressed with Beast Boy's skills, the Doom Patrol allowed him to become a member of their group. Though he and Rita eventually adopted Garfield, Mento raised him harshly and sometimes was very difficult to work with because of his harsh nature and terrible teaching methods.
During a mission against the Brain, Beast Boy had chosen to save his family over completing their quest, which earned chastising from Mento. Fed up with his adoptive father's harsh rule, Gar left the team and headed to Jump City, where he became a founding member of the Teen Titans.