Percentages can be used when a role can have multiple effects. For example, 50% chance to learn one status or 50% chance to learn another (in games with two statuses) or something similar. The result will be certain, but which one specifically is up to chance. Or with duelists, 50% chance to kill the opponent, 50% chance to die themselves; one corpse is guaranteed, but whose – that's up to fate.
🏹🎪+⛓️♿=💕