Digital character design is an important research area in the fields of computer animation and digital game. The design of monsters has also been largely applied to digital games. To enhance a designer's design creativity, this research proposed a method to design the shape of monsters in digital games, and the method was evaluated empirically. According to the study, the design method can actually assist some of the novice to design digital game monsters, and, by following this method in the design process can also increase the novice's design creativity, which includes design fluency, flexibility, and elaboration. Furthermore, from the results of expert's evaluation empirically, it is found that the proposed design method can also effectively improve the innovation, adaptability, and completeness in the novice's works, wherein, to improve design elaboration of novice will play the most important role.