Changeling Infantrist.

Mercenary Deserter - Heavy Infantry (custom class)
STR +2, TOU +1, AGI 0, PRE -2, 7 HP
Armed with a Halberd d10, Messer d6, Fire bomb d10 (one use) and a Pistol d6+2 (ignores armor) (one shot)
Wears heavy armor (tier 3, -d6)
Heavy Infantry: DR-2 When fighting in formation (at least 3 infantrists)
Queenless Changeling: You are stuck in your true form until you find a queen whose power you can use to shapeshift, or need to metamorph into a queen yourself.

For a Black Powder and Brimstone campaign set in a Equestria at War scenario.