Lucia Yonatsu is a supporting character in the anime Shadowverse Flame: Arc-hen. He is a male Shadowverse player with a height of 175 centimeters and a birthday of August 2. His background centers on a protective bond with his sister Shiori Yonazuki, and he carries a sense of responsibility toward her safety. In the storyline, Lucia joins the main protagonist Light and his companions in their mission to stop the Arc Ruler from remaking the world and to neutralize the three towers that threaten destruction, while also confronting rogue digital friends called Shade. His personality is calm and collected, often displaying a relaxed and measured demeanor. He is strategic and unafraid of taking risks in battle, using a Bloodcraft deck that relies on Vengeance effects, which activate when his defense falls to ten or below. This playstyle reflects his willingness to accept high-risk situations for decisive outcomes. Throughout the series, Lucia develops stronger bonds with his teammates and grows more confident in his abilities as a player. His key relationships include his sister Shiori and his fellow Shadowverse competitors. Notable abilities include his expertise in Vengeance-themed strategies, allowing him to turn matches in his favor when his health is under pressure.