The Assassin is a damage dealing type hero in Planet of Heroes. Assassins mostly focus on single targets, their goal is to choose the most dangerous enemy and to take him down as fast as possible. The Duelist Assassin specialize in dealing large amounts of damage to a single target in a short amount of time. They have abilities that allow them to pursue a target or prevent it from fleeing. The Mage Assassin are ranged heroes who specialize in dealing large amounts of AoE damage. Their abilities are more challenging to use than those of other heroes of their class, but they have powerful combos. They have at least two offensive AoE abilities and at least one control effect in most circumstances.

Characters in these roles are: