The Support

Not to be confused with the other kind of support character, secondary characters who help the story progress by interacting with the main characters.

A Support Character is one who aids the main character through their adventure to some meaningful extent. This can be directly or indirectly. If they're helping the main character via direct contact, then they're likely to be one of the Good Guys and at the Hero's side most of the time, giving pointers on how to be better at what it is they do or lending a hand in battle. If this Support Character is helping indirectly, they could be sending resources (like food or money) to the main character from a distance. A Support Character does not always have to fight in adventurous stories. They can be a Healer who stays out of the action and to whom injured fighters on their side report when they need medical attention.