The Support

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

A Support Character is one that 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 (either the Hero or Main Guy) from a distance.