A.D. Police Files, a 1990s cyberpunk anime about a police force that fought rogue robots and leveled the city doing so, had their own take on this in "The Man Who Bites His Tongue." An officer is critically injured and his last functioning organs--his tongue and brain--are put into a robot. A newly minted tank that can go one-on-one with other unstoppable machines that reminds himself of his humanity by biting his tongue.
Naturally, His evil creator has plans to scrap him after he performs poorly by acting more mechanical than human after the public reject the idea of a man inside a machine. This is the same public that deals with literal miles of property damage and explosions on a daily basis from machines so the future has a low tolerance for failure.
So, our cyborg overdoses on a drug that inhibits his emotions, goes into a delusion he's with his girlfriend while he actually slaughters his fellow officers. He recovers enough to beg his girlfriend to shoot him with (conveniently) an anti-tank rifle in the tongue so he can feel enough pain to die.
Both the mouth and gun are a reference to the original Robocop when one of the criminals suggests they "aim for the mouth" with their own anti-armor ordinance as they hunt an injured Robocop and Lewis in an abandoned factory. The joke being they think its face is human, but an earlier remark from an OCP official that the only organic components to Robocop are parts of Alex Murphy's brain and his face stretched across a metal skull.
Maybe because we've had 27 years to digest it in pop culture, but the overwhelming feeling of Robocop is it is not Alex Murphy. It learns to call itself Murphy, it learns to respond to Murphy and it learns to process emotions like revenge and anger but Robocop isn't Alex Murphy.