Believe it or not, your side characters are just as important as your main character. While you may not develop them as much as your main character, they are still a crucial part of your novel.
Ron Weasley, Primrose Everdeen, Samwise Gamgee… the list could go on forever. You probably know who these characters are, and if you have read the books, or seen the movies then you could probably name some characteristics of them.
Every book has more than one character (at least the ones that I have read) so while your main character will be the most prominent of the bunch, you need to make some side characters stand out as well. If you enjoy television, you know what I mean. The script writers create side characters like there is no tomorrow and once you get attached to one of them, something awful happens and they die.
Okay, rant over. Now back to books. So in order to create a lovable and memorable side character you need to give them some characteristics, some physical traits, and hey-maybe even an entire scene to themselves.
By doing this you are making your novel more interesting and complex, even though all you are really doing is adding some well-needed traits to your characters. Could you imagine the Harry Potter series without Ron Weasley?
Probably not, because he’s very involved in the series. So start developing those side characters right now! You probably already know a little bit about your side characters just from what you picture in your head when you think of them. Now all you have to do is make the readers see that!