Using the Human Body to Express Emotions
If you don't manage your emotions, then your emotions will manage you. ~Doc Childre and Deborah Rozman, Transforming Anxiety
Emotions don't always have to be expressed through images. The human body often betrays its inner thoughts without realizing it. The subtle clenching of a fist may suggest boiling anger. A quick flash of sadness in the eyes is more than enough to reveal feelings of betrayal or hurt.
This is what makes roleplaying fun. By using the body (body language), you can tell other characters what your character is feeling without saying anything to them at all. The great thing is that they can simply react to those emotions while continuing the roleplay's story.
Take a look at these two simple posts I made. Pretend I'm roleplaying as Belinda, and you're Mike. Compare them, and see which one might be more fun to respond to.First Post: Belinda walked into the kitchen. She saw Mike. "What are you doing here?"Second Post: Belinda slammed the door and stormed into the kitchen, her eyes boring in on Mike. "What are you doing here?"The first post positively reeks of lameness. It's tasteless, unappetizing, and probably causes the reader to turn away in disgust. You can barely tell what she was feeling. However, the second one is a little different. While I never said that Belinda was angry, her actions suggested it. Look at the way she closed the door and reacted to Mike's presence.
Make it easy for other roleplayers to read your character's emotions. While you don't need to make him an open book, at least prevent him from being emotionless. There is no such thing as a person without emotions - it's not natural, unless if surgery has been done, blah blah blah. You get me?