In my own writing, I don’t usually work with a large cast of characters. I like simple stories that are more or less stripped down to their bare essentials. Whenever I write a scene that has more than two characters, I tend to get worried about whether or not everyone is getting equal billing.
Has the third wheel gotten enough lines? Do they even have anything to add at this point? Will the reader wonder where they’ve gone if I don’t mention them soon? It’s a point of stress for me that I try to avoid whenever I can.
That being said, I see absolutely no reason I can’t offer you advice on the topic. Just think about it like someone with agoraphobia giving you tips on how to enjoy the great outdoors. At the very least, it could be entertaining. And, really, what else do you have to do for the next five minutes?
(Most likely the answer is a lot of other things, but for now let’s pretend your schedule’s wide open.) So buckle up. Here we go.