System for generating customized images to be displayed within an electronic message. System retrieves communication data associated with a communication between a first user and a second user. System determines a relationship between the first user and the second user based on the communication data and generates avatar characteristics based on the relationship. System generates an image including a first avatar representing the first user and a second avatar representing the second user. The first and second avatars are generated based on the avatar characteristics. System causes the image to be displayed. Other embodiments are described herein.