Primary

• Anzu Mazaki Friend of Yuugi Mutou
• Anzu Mazaki Friend of Katsuya Jonouchi
• Anzu Mazaki Friend of Hiroto Honda

Extended

• Katsuya Jonouchi Older Brother of Serenity Wheeler
• Katsuya Jonouchi Friend of Mai Kujaku
• Katsuya Jonouchi Best friend of Yuugi Mutou
• Katsuya Jonouchi Friend of Hiroto Honda
• Katsuya Jonouchi Friend of Anzu Mazaki
• Yuugi Mutou Grandson of Sugoroku Mutou
• Yuugi Mutou Best friend of Katsuya Jonouchi
• Yuugi Mutou Friend of Hiroto Honda
• Yuugi Mutou Friend of Anzu Mazaki
• Yuugi Mutou Alter Ego of Yami Yuugi
• Hiroto Honda Friend of Yuugi Mutou
• Hiroto Honda Friend of Katsuya Jonouchi
• Hiroto Honda Friend of Anzu Mazaki