The Engineering Design Monster Manual is a playful yet practical guide that reimagines the tools, methods, and frameworks of engineering design as creatures in a fantastical bestiary. Each "monster" embodies a different representation-like UML diagrams, system maps, Gantt charts, or flowcharts-complete with descriptions of their origins, powers, weaknesses, and the situations in which they thrive. Written in the style of a role-playing handbook, the manual blends humor with insight, helping students and practitioners alike recognize how design tools shape the way engineers think, collaborate, and solve problems. Both an educational resource and a conversation starter, it encourages readers to approach design with curiosity, creativity, and a sense of adventure.