I will say if you're going to have a supporting cast in your work, you should think about color coding, at the very least your spoken dialog. Without it, it can be a chore trying to figure out who is speaking and when. Not everyone excels at having different personalities for each of their cast of characters. So if you choose to go gray plain text, then you should opt to make it very clear who is speaking and when. If those that judge your work are unaware of who is who, it can hurt you when decisions are made.