Homebrew
Brave. The grenadier has advantage on saving throws against being frightened.
Multiattack. The grenadier can make two melee attacks. It can replace one melee attack with a Musket attack.
Musket. Ranged Weapon Attack: +4 to hit, range 120'/480', misfire 2, one target. Hit: 8 (1d12 + 2) piercing damage.
Shortsword. Melee Weapon Attack: +4 to hit, reach 5', one target. Hit: 5 (1d6 + 2) piercing damage.
Hand Grenade 2/Day). The grenadier throws one grenade at a target within a 60' range. Saving throw: All creatures within a 5' radius of the target must make a DC 12 Dexterity saving throw. Any object within the radius fails the saving throw. Failure: The creature takes 7 (2d6) thunder damage & 7 (2d6) fire damage. Success: The creature takes half of the above damage.
Any Climate; Any Terrain