Specialists control robotic allies called Gremlins and are often used as medics.
Grenadiers are useful for the range and radius of their grenades. Sharpshooters have great aim but can only use their sniper rifle if they have not moved yet in the turn. The other two types of soldiers you can get are Rookies (with no special abilities) and Psi Operatives (all the special abilities). There are four main classes of soldiers in the base game: Sharpshooter, Grenadier, Specialist, and Ranger. It’s like in Ender’s Game, except I am decidedly not Ender.
The Commander controls soldiers in each mission and manages research and contacting resistance as well. The player acts as the Commander, who was rescued at the start of the game after having been captured by ADVENT for twenty years. A Ranger being faced down by a Secotopod and Stun Lancer