Batmen

Batmen where a group of people who were inspired by Batman. Members of the party have suffered injustice and decided to follow Batman's footsteps. Most members of the party (who have been seen) are teenagers and only one of them notably is an adult,Brian Douglas.

Weapons
Unlike Batman the Batmen used air rifles in the meeting between Scarecrow (Cillian Murphy) and The Chechen which possibly means that they kill criminals instead of capturing them.