This is a bounty entry.

Weight: 1.0

Trigger + Appearance: blackdahlia, single mechanical arm, weapon, arm cannon, grenade launcher, short hair, blonde hair, mask, veil

Default Outfit: hat feather, white cape, black dress, strapless dress, side slit, white gloves, elbow gloves, white thighhighs, cleavage

Grenade launcher's worse in Pony than 1.5 tbh.

The results of your generations are dependent on the additional LoRAs, weights, and models you use, so it may not work or come out as consistent as my sample images.