15) Roleplaying Alone. Roleplay is all about interaction. However, occasionally, someone in a roleplay will not put any effort into interacting with other characters. They may continually post what their character is doing far off in some distant place. Sometimes they seem content to play alone; other times they will complain that no one is roleplaying with them. If you want your character to get attention, put them someplace where other characters are and initiate contact. Don't expect everyone else to come to you. At the same time, if you don't mind not interacting with other characters, why roleplay at all when you can just write a story?
16) Just Thoughts. If you want other characters to react to your character, your character has to do something. No other character can read your characters thoughts. If your character is just thinking, as far as anyone else can tell, your character is just standing around.
17) Passivity. A roleplay post typically involves a reaction to previous actions and an action for others to react to. However, some people lean to much on their roleplay partner to get things going and keep them going. For example, a character may only give short answers like "Uh huh" and "yeah" while in a conversation with another character, forcing the other player ot come up with interesting conversation topics with nothing to work from.