Building pedagogical applications in virtual worlds is a multi-disciplinary endeavor that involves learning theories, application development framework, and mediated communication theories. This paper presents a project that integrates game-based learning, multi-agent system architecture (MAS), and the theory of Transformed Social Interaction (TSI), the project implements a group of engaging, affectionate and effective pedagogical agents equipped with abilities of self-representation, emotional states reasoning and situational awareness. A prototype of a virtual quiz show, QuizMASter, has been implemented to realize these abilities, and will be used to test for the effectiveness of the approach.