Classes in Pathfinder: Kingmaker is a factor that determines your character's abilities, attributes and how they will develop as they increase in level. In Pathfinder: Kingmaker, each class will have some archetypes, serve as the sub-class. Some of the classes have certain requirements, you can only choose them after you reached a certain level.
Prestige Classes are a sort of advanced class that requires the character reach level 5 before taking prestige class levels and each have their own prerequisites.
Alchemists use alchemy to create explosive artifacts that can be used in battle and mutagen, a brew that can be used to enhance physical abilities.
Barbarians excel in close quarter combat. They have high health and damage reduction and have a unique ability called rage that boosts their physical abilities.
Bards can use abilities that boosts his and ally's abilities in a range. They are fit for any role but work best as supports.
Clerics excel at using healing magic and divine power. Their magic abilities work best against undead enemies.
Druids can use spells that are related to nature. They also have an animal companion that aids them in battle.
Fighters excel in close quarter combat. They can use a wide array of weapons and armor.
Inquisitors can use magic to buff themselves to fight specific enemies. They can also acquire teamwork feats that buffs companions.
Magus combines both magic and weapons while in combat. They use spells with focus on enhancing weapons and armor.
Monks can use their fists as weapons providing with strong unarmed attacks. They are not proficient with armors and use Wisdom as a bonus to AC.
Paladins can both participate in battle and aid companions by healing them. They focus on spells that are effective against evil.
Rangers can use both melee and ranged weapons. They cane specialize on a specific type of enemy providing with additional damage against it.
Rouges excel in stealth and provide with trap detection and pickling abilities. They are also agile providing with good evasion and better roll saves.
Sorcerers use spells in battle. These spells are learned when leveling up and don't need to be prepared, allowing for frequent use. They can also choose a bloodline granting additional power to their spells.
Wizards use spells in battle. They can learn any numbers of spells, but they need to prepare them in order to be used in battle. Wizards can also specialize in one school of magic, gaining additional spells and powers based on that school
Arcane Tricksters use both magic and rouge abilities. They can perform sneak attacks regardless of the enemy awareness and become invisible using magic.
Dragon Disciples use magic and dragon powers in battle. They receive additional ability scores and can transform into a dragon.
Eldritch Knights fight in close quarter combat or can use magic abilities from a distance. They can be very versatile adjusting to any situation.
Mystic Theurges can perform magic to aid allies or harm enemies. They have a special ability that allows casting two spells at once.
Stalwart Defenders focus on defensive abilities. They sacrifice damage and mobility while gaining damage reduction and better save throws.
Duelists focus on close quarter combat and dodging. They sacrifice armor capabilities to gain additional dodge chance and damage for critical strikes.