Classes are the archetypes representing the heroes you control during the game of Gloomhaven. Rather than representing an individual person, classes are more akin to "jobs" or "archetypes", so multiple of each class may exist in the world of Gloomhaven.
At the start of the game, only that games' (and its expansions') Starting Classes are unlocked; other classes must be unlocked by completing Personal Quests or accomplishing other objectives that unlock them.
Classes each have unique hand sizes, health, perks, and cards. Unlocking locked classes unlocks events listed on their character mat. Retiring any character unlocks events, also listed on the character mat. As a class levels, you must select one of the two level up cards of the newly gained level, or pick an unselected card from a prior level. When choosing cards, players may pick the newly gained card as one of the cards that compose their hand for that scenario; hand size remains the same.
In scenarios, classes are represented by figures, which are what the move and attack with, and what the enemies attack in order to deal you damage.
A complex character who uses a system of tokens to move different speeds and use crowd control and deal damage on some rounds while be less effective on others.
An area attacker with two forms, each with their own separate hands; one melee-focused and one ranged-focus, who swap between them by playing specific effects