Zenon is a cold, ruthless individual who prioritizes power and logic over emotion, believing that strength is the only path to achieving one’s goals. Unlike his siblings, he approaches battle with brutal efficiency, eliminating threats quickly and mercilessly for the sake of the Spade Kingdom’s glory. However, his tragic past with his friend Allen reveals a deeper, conflicted side to him, as his decision to kill Allen in pursuit of a "greater good" haunts him throughout his life, driving his obsession with strength and his belief that emotions are a hindrance.