Someone with experience could be helpful. Someone who is wise and learned and patient. A trusted advisor to steer you in the right direction.
The Hero's Journey wouldn't be complete without one. These people are often called Mentors and Mentors are widely used in storytelling. You may remember some of these:
Gandalf in Lord of the Rings
Dumbledore in Harry Potter
Obi Wan Kenobi in Star Wars
Merlin in The Once and Future King
The Fairy Godmother in Cinderella
Glinda, the Good Witch in The Wizard of Oz
If your hero wants to do the right thing, or needs to do the right thing, but can’t figure it out on his own, here are some ways Mentors help him stay on his path:
1. The voice of reason – if your hero has trouble deciding what to do or where to go, the Mentor can advise with helpful hints.
2. Be a teacher – sometimes your hero may need education or illustration to start on a quest. The Mentor could supply the necessary information.
3. Motivate – heroes are often reluctant. Leaping off a cliff doesn't always come naturally. The Mentor can provide encouragement to ensure the hero follows through.
4. Initiate – your hero may not be a skillful lover or understand the delicacy of diplomacy. The Mentor may impart these worthwhile traits.
5. Training – if your hero has to face a group of expert marksmen at high noon, and he’s never shot a gun, he may be in real trouble. The Mentor can provide training to save the hero from unwelcome disaster.
Former heroes make wonderful Mentors. They understand the perils (mental, emotional, and physical) that the hero is going through and can offer wisdom from their own experiences. They've survived their own quests and are now passing on the lessons they've learned.
Not all Mentors have to be adventure stars. Mentors can assume any occupation. They can be school teachers, businessmen (or women), bus drivers, bank tellers, software engineers, bakers, anything you can think of. How they interact with your hero is much more important than what they do. Their life experiences lend them credibility and advantage and make them useful to your hero. Without them, your hero will stray and fall into trouble. With them, your hero will surpass the obstacles and shine.
Who is the Mentor in your story? What is his/her purpose? How does he/she help the hero?