You might be surprised what google images comes up with when you search for "hero archetypes" with some great worksheets that you can print and pass out for them to choose from.
Good ones are from movies which also make it very easy to understand the character and play it better than with just a description.http://www.soulcraft.co/essays/the_12_common_archetypes.html
Has a nice set with some descriptions too. https://www.empmuseum.org/media/200990/emp_fantasy_gallery_guide_for_educators.pdf
The Knight: The knight is a master combatant, born leader, and trusted guardian whose devotion to duty sustains him on seemingly hopeless quests.
The Mythic Warrior: This is no ordinary warrior. The archetypal hero of myth is born with extraordinary gifts and is destined to overcome the greatest evils of his day.
The Damsel: Known for her beauty and virtue, the damsel is at the mercy of villains until she finds her hero.
The Rogue: The rogue believes rules are meant to be broken. He is an outlaw with talents for deception, trickery, and swashbuckling adventure.
The Iron Woman: The iron woman maintains a position of high leadership, and is a brave and trusted guardian of her people. She is steady and disciplined, even in times of crisis.
The Witch: Gifted with incredible powers at a young age but forced into isolation, the witch usually lives alone and embittered. She is deeply misunderstood and feared by others.
The Hero’s Muse: The hero’s muse is kind, beautiful, and patient. She is connected to the concept of Paradise, and this quality makes her more powerful than she appears.
The Unlikely Hero: Despite humble origins and modest skills, the unlikely hero’s courage and good fortune triumph over desperate circumstances.
The Companion: A hero’s companion is often easier to relate to than the hero. The companion is loyal and can provide a practical and optimistic point of view, even in the darkest of times.
The Mystic: The mystic’s ability to see into the future makes him a valuable ally, but his solitary, introverted, and seemingly erratic nature often leads him to be judged unfairly.
The Magical Prodigy: The magical prodigy is born with extraordinary abilities, but faces a painful path of arduous training, dangerous rites of passage, and an unfair burden of responsibility.
The Earth-Shaker: The earth-shaker’s emotional turbulence, underdeveloped sense of morality, and sheer physical power make him an intimidating threat for any hero.
The Warbringer: The warbringer is contentious, determined, and recklessly brave. His uncontrollable impulse for violence and conflict is both the source of his power and his biggest weakness.
The Anti-Hero: Self-centered or misanthropic, the last thing the anti-hero wants is to be a hero, but the story pushes them where they’re least comfortable and by acting to save themselves they just might save others ... or even the world.
I had to stop looking now. Your topic interests me greatly.