To insert your characters portrait into comments, get the web address of the picture from the characters page (right click > properties, with internet explorer, or right click > copy image location with firefox), and paste this into your text with a ! before and after the link. To make sections bold, put an * before and after the bolded text.
!http://cdn.obsidianportal.com/images/158381/Thadeus_thumb_48.bmp! *Thadeus says:* I'm a badass
Thadeus says: I’m a badass