Synfael was the emperor's right-hand and greatest companion, a demon with gravitas and an elegant presence. Although an excellent warrior, he also enjoyed fine things, making him unique in a demon culture. "A warrior needs to be refined and cultured," he asserted. His tastes were refined and flamboyant. "When everything else is destroyed, culture remains. I cherish it more than gold."

Whenever possible, he visited one of the demon empire's many lush gardens, each an oasis filled with beautiful flowers and lush greenery. From the center of the empire, the Gardens of Desire spread out like a rainbow, and each season brought a new burst of color. Synfael delighted in the scenery and its calming atmosphere. He spent hours socializing, but he also took time to meditate and contemplate life's mysteries.

His voice was deep and smooth like velvet with hints of honey and liquor. Despite his intense appearance, his behavior was gentlemanly and polite, almost too agreeable. His tone could be friendly, but when fighting, he was focused and ruthless. "Showing mercy to one's enemy is a mistake that can lead to a loss of demon lives," he explained to passersby upon finding and eliminating an angel spy.