Intelligent virtual characters has been subject to exponential growth in the last decades and they are utilized in many applications areas such as education, training, human-computer interfaces and entertainment. In this paper, we present a state-of-the-art of virtual human mentioning about the use of intelligent decision technologies in order to build virtual human architectures. We consider various aspects such as autonomy, interaction, personification and presence. Each of these aspects comes to prominence in different applications although there is no slight distinction. This survey provides a novel insight to the current state of designing and modeling virtual humans using different decision technologies and can be used as a basis for several future directions.