Primary

• Yuusei Fudou Best friend of Jack Atlas
• Yuusei Fudou Friend of Kyosuke Kiryu
• Yuusei Fudou Friend of Lua
• Yuusei Fudou Friend of Luca
• Yuusei Fudou Friend of Aki Izayoi

Extended

• Jack Atlas Best friend of Yuusei Fudou
• Jack Atlas Friend of Kyosuke Kiryu
• Jack Atlas In love with Carly Nagisa
• Jack Atlas Friend of Aki Izayoi
• Jack Atlas Friend of Lua
• Jack Atlas Friend of Luca
• Jack Atlas Friend of Bruno
• Luca Friend of Ancient Fairy Dragon
• Luca Sister of Lua
• Luca Friend of Yuusei Fudou
• Luca Friend of Jack Atlas
• Luca Friend of Aki Izayoi
• Aki Izayoi In love with Yuusei Fudou