In TOON you take elements from all cartoons, the wackier the better. You can play a bunny with clothes, or a Biker Mouse from Mars or Superman or My Little Pony if the mood takes you. Your character is one of a number of possible character types in a medieval world where damsels in distress, dragons, dwarves, orcs, and Beholders are all real. For a quick beginner's lightweight idea of what the game, gameworld, and characters are like, catch the animated Dungeons and Dragons series on your local FOX network. Clerics, being the followers of a fictitious God in the game, can only do certain spells and only use certain weapons, for example.
Warriors have different restrictions.
There are a handful of these type of fantasy games. However, there is still a stats system to keep you honest and the games balanced. Marvel Comics and DC Comics each have their own. Gameplay in this genere can vary from lighthearted to deadly serious and mature-themed. Gameplay again can vary from lighthearted and playful to serious and intense.