Homebrew
Gunner. The Lamplighter has a quick hand & keen eye when employing firearms, granting it the following benefits:
Shortsword. Weapon Melee Attack: +4 to hit, reach 5', one target. Hit: 5 (1d6 + 2) piercing damage.
Musket. Ranged Weapon Attack: +4 to hit, range 120'/480', reload 1, misfire 2, one target. Hit: 8 (1d12 + 2) piercing damage.
Steady Aim. The Lamplighter prepares themselves, giving them advantage on their next attack roll on the current turn. It can only use this feature if it hasn't moved during this turn, & after the Lamplighter's speed is 0 until the end of the current turn.
Whistle. The Lamplighter blows a series of shrill notes, alerting any nearby Lamplighters to potential danger. This summons 2 (1d4) lamplighter constables that will make their way to the whistleblower by the most convenient route. This will usually take 3 (1d6) rounds of combat for the reinforcements to arrive, but this is entirely at the DM's discretion.
Urban