A bit odd to see both a flintlock pistol and a cartridge rifle on the same character, but definitely interesting.
Are her arms covered in some kind of armor plating or are they mechanical replacements?
She is an Artificer: Armorer from DnD 5e. Quote from the rules, " Second Skin. The armor’s weight is negligible, and it becomes formfitting and wearable under clothing. If the armor normally imposes disadvantage on Dexterity (Stealth) checks, the power armor doesn’t. "
Her rifle is infused with "repeater" so it ignores the loading property. Her pistol is her spellcasting focus for her Firebolt spell.