Several enhancements to a real-time communications user interface are provided to add functionality and personality in such communications as instant messaging. These enhancements are geared at least in part to making the user interface more personalized between users in a real-time communication session, including personalized fonts, spacing, extensible emoticons, etc. Other enhancements are geared in part toward enhancing the use of the interface. For example, a dynamically changing input box may remove a need for scroll bars, and edit control of previous messages may remove the need to send corrective messages. A number of these enhancements may be accomplished through the use of markup languages in the user interface. One or more of the disclosed enhancements may improve the immediacy, readability, and functionality of instant message conversations.