Roberto

Roberto is a criminally insane robot, serial bank robber, and an old friend of Bender. He was built by a couple of engineers with a desire to build a completely insane robot. According to Roberto, however, "they failed!" However, he is still one of the most unstable and dangerous robots in New New York. He robbed a bank but got away while Bender and Fry were arrested for his crime. After robbing the same bank a second time, he was put in the same robot asylum as Fry and Bender (and unfortunately Fry's new cellmate). After escaping with Bender, he robbed the bank a third time, and took cover in the Planet Express building, holding the employees hostage. After a scuffle with Fry (and the revelation that his mental and emotional problems may have been the result of years of abuse), he jumped out the window and was eventually caught. He later appeared to be upgraded to accept next generation Robots. He was also at Nixon's Big Robot Party where all robots were to be destroyed.

In Bender's alternative reality, Cornwood, Roberto was the King of Cornwood. Recently, he was sent in jail on Will Riker's Island and seems to have replaced his knife with a sock.

Trivia

 * Roberto seems to have an interest in stabbing things, and even has his own "Stabbing Knife" almost everywhere he goes. It seems to be a deranged favorite hobby of his.
 * He mentions his "mother" during the only real time he has shown any fear, who he is referring to may or may not be Mom, Roberto brings up that she welded him to a wall at one point which seems to be one of the reasons for his insanity.
 * Roberto is the 3rd Build-a-Bot in Toynami's Futurama figure line. He is also the first to only go through 2 series instead of 3 (with 2 figures a series).
 * The shape of his eyes resembles some sort of mask and his body resembles a tombstone which fits with his personality with it being a person who loves money and killing things.