With the evolution of computer gaming hardware causing entertainment to change, on-screen PvP video games still remain to be the most popular option. Most of these games have a game mode versus CP(Computer Player). However the experience in such modes can lack satisfaction on the player side due to the lack of engagement, challenge, and involvement. This research will design and evaluate an auxiliary system that enhances the experience of playing against CP by using an on-screen virtual agent. Emotion will be synthesized through an emotion engine using the game state as an input, and the agent will display facial expressions and appropriate utterances.