If by "If they had articles of them written" that means that you can make them into OCs, that is fine. "Siren Head is not an SCP" memes are fine. If it isn't SCP-related, don't post it. Try "Trevor_Henderson" or "TrevorAndSCP". Due to being an SCP, Big Charlie is fine as long as refered to as SCP-4158. If you have any other questions, please reply to this comment.