Leonard holds the title of Guardian of Light within the Seijū universe, standing among eight fellow guardians. Together, they preserve universal balance through the elemental force Sacrea. Leonard specifically governs the light element, his actions essential to maintaining stability and harmony. His counterparts command other Sacrea elements: darkness, earth, fire, water, dreams, wind, steel, and nature.

Operating under Queen Angelique Collette's authority, Leonard fulfills duties critical to the cosmic structure. His role demands constant collaboration with the other guardians to confront crises endangering their world. Within this system, every guardian's mastery over their assigned Sacrea proves indispensable for sustaining universal equilibrium.