Kenshi's combat allows for diverse roles. Heavy Weapon Specialists (Strength, Heavy Weapons, Toughness) deal massive damage but are slow. Dexterity Fighters (Dexterity, Katana/Sabre, Dodge) are fast and agile. Martial Artists (Martial Arts, Dodge, Toughness) fight unarmed and scale incredibly well. Crossbowmen (Precision Shooting, Crossbows, Perception) provide ranged support. A balanced squad will have a mix of these roles to cover different combat situations.
