The development of lightweight structures that minimize material usage while meeting desired mechanical properties have become a research focus due to advancements in manufacturing technologies. Additive manufacturing methods have accelerated research in this field by enabling researchers to quickly produce and test prototypes of new designs. Auxetic structures, a class of advanced materials, exhibit the unique property of expanding under tension and contracting under compression, resulting in a negative Poisson’s ratio (NPR). These structures offer significant advantages in energy absorption, enhanced flexibility and range of motion, improved mechanical properties, adaptability and comfort, and filtration and insulation, making them attractive for various applications. This study focuses on the theoretical investigation of 16 different 2D Auxetic structures and their classification based on characteristic properties for aerospace structural applications. Among these mechanical patterns, the Re-Entrant Chiral Auxetic (RCA) pattern exhibits a superior Specific Energy Absorption (SEA) value compared to other Auxetic patterns within the same volume while maintaining a lower density. Also, this selected pattern combines the topological features of re-entrant and chiral honeycombs. Consequently, the RCA pattern is identified as the most optimal design for aerospace structural parts.