I think the guidelines mean like no MAIN characters under 16, so you can have them as a side character or something. I believe what I said also applies to covers, so you could probably have them there, just not as the main focus. 
I think the guidelines mean like no MAIN characters under 16, so you can have them as a side character or something. I believe what I said also applies to covers, so you could probably have them there, just not as the main focus.