Musketeer!
Strong attack, weak armour to oponents with guns
Ability to swift between rifle and rapier
Concept Art, straight from google:
Horse Trooper
Strong against standing units, but the spear-armed ones.
Weapons: sword and pistol
Concept art, straight from google:
Pikeman
Strong against horse armed units, only close combat melee.
Concept art, straight from google:
Bombard:
Heavy unit that can take out large groups of soldiers or buildings, weka against cavalry.
Concept art: