Sometimes good hero needs a sidekick or a best friend. They can provide the comic relief as Ron Weasley so often did. They can be helpful and save your hero’s behind like Timon and Pumbaa. They can sometimes be annoying like Edmund in the Narnia books (or worse like Eustace Scrubb). Sometimes, the sidekick simply gets your characters into more shenanigans like Ethel of I Love Lucy.
Either way, your character isn’t a solitary figure. (Unless you are writing about the last man in the entire world). Use those people around them to create a richer world and a richer character.
Here are some pictures of my two favorite best buddies: