Miuccia Miuller | Corruption

Miu Miu is the ruthless lead guard of the visiting rooms at Green Dolphin Street Prison.

Miu Miu seems to take her job as a guard rather seriously. Contrary to other guards, Miu Miu doesn't automatically use excessive force when dealing with the prisoners as she opted to openly confront Jolyne and show her Stand Jail House Lock as a warning first. This implies Miu Miu was willing to let Jolyne be if the latter didn't try to escape.

While Miu Miu is generally less violent than the average guard, she remains a truly ruthless warden. As soon as she deems someone a prison breaker she doesn't hesitate to use lethal force. She was even willing to shoot Emporio, a small boy, to stop Jolyne. After Jolyne causes her more trouble than she expected, Miu Miu does confess that she's pleased at the prospect of Jolyne being shot down by the guards. Miu Miu is, like most Stand users, very confident in Jail House Lock and states that nobody can escape it.Miu Miu seems to know her Stand well and is able to come up with several stratagems to exploit Jail House Lock's power, usually consisting in overwhelming her foes with information and perform sneak attacks. She has a modicum of tactical ability in a fight. For instance, she manipulated Jolyne into leading her towards her hidden ally Emporio. She also breaks Jolyne's arms in-order to stop her from deflecting bullets.

Miu Miu is a corrupt cop and abusing the user

Miu Miu: Miu Miu. My Stand's name is Jail House Lock. I'm showing it to you in order to warn you.