Warden: Well Taurus Bulba, I trust you're still enjoying your stay in prison?
Taurus: It's peaceful, no one bothers me...actually, it suites my business needs perfectly.
~ Taurus Bulba and the Warden

Inmates are villains who are imprisoned in a jail, yet manage to keep power even within prison and pose a threat within the prison itself. This type of antagonist is common in fiction dealing with prisons and may go hand in hand with the related Gaoler character type.

This is also the place to put prison gangs and their members, which are similar to street gangs but function primarily within the confines of prison (both fictional and real).

Good examples include almost anyone from either Batman: Arkham Asylum or its sequel, Batman: Arkham City.

Editing note: please only include characters who are in a prison and have some degree of power within the confines of their prison (for example, a powerful prison gang or a crime lord who functions mainly from behind bars). Not characters who are simply imprisoned and have no effect on other characters.