Bender is often mean and disrespectful in regards to other people's feelings. At one point, he flushed Leela's beloved pet Nibbler down the toilet, and didn't feel bad about it until the Professor attached an empathy chip to his head, forcing him to feel other people's emotions. He is also quite arrogant, frequently bragging about how great he is. Bender has no emotion about committing crimes and often steals people's wallets or items from shops. He loves smoking and drinking, though as a robot he has to drink alcohol to keep him going. (The cigars just make him look cool.) Bender can also be cruel at times and even sometimes treats his own friends badly. He is also extremely lazy, and is often seen sitting around on the couch drinking a beer and/or watching television.
However, he is capable of caring for others and is close friends with Leela and Fry, even though he often acts obnoxious and mean towards them. Bender seems genuinely happy for Leela when she is reunited with her long lost parents and was devastated when he is ordered to kill Fry in Bender's Big Score. Considering he is still upset when he returns to the future it's possible he might have been mourning Fry for nearly a thousand years.
