Riley Akaba
Declan's adopted younger sister and daughter of Leo and Henrietta Akaba. For most of the series, she is mistaken and referred as a boy due to her masculine clothing until the final Duel against Zarc. She is a student of Leo Institute of Dueling who is very shy and seems reluctant to Duel unless her older brother watches the match. Riley originated from a war-torn country, the ordeal of mistrust and constantly living in fear causing the girl to emotionally shut down as a defense mechanism. However, her interaction with Yuya and his friends slowly make her regain her sense of self and her meeting with Jack made Riley gain her resolve to fight to protect her comrades. Her experience as a war victim granted Riley an ability to sense and read other people's hearts, allowing her to hear the rage of Four Heavenly Dragons and a partially reconstituted Ray as consequence. In duel against Zarc, Riley allows Ray to possess her body so she can defeat Zarc. But the moment Ray defeated Zarc, Riley forced the spirit out of her body and used the En Cards' power to extract Zarc's disembodied essence from Yuya to prevent him from making another return. Since the En Cards turns all power into pure existence, Riley is reborn as an infant girl yet her quick absorption of Zarc's essence kept her from being splintered with the dimensions. However, Riley is rendered catatonic while the evil soul begins to gradually take over the child's body. Declan sees Yuya as the only person who can save Riley from being consumed by Zarc by getting the infant to smile. Riley finally able to smile once Zarc's soul inside her is pacified by Yuya's last duel against Declan, freeing her from the evil soul. Like Declan, Riley's C/C deck uses multiple summoning methods.