Canon Character's Children

[ChaosLacky]

Duel Monsters:
Yugi Muto - none
Joey Wheeler (Jounouchi Katsuya) - none
Tristan Taylor (Honda Hiroto) - none
Duke Devlin (Otogi Ryuji) - none
Ryo Bakura - none
Seto Kaiba - none
Mokuba Kaiba - none
Téa Gardner (Anzu Mazaki) - none
Mai Valentine (Mai Kujaku) - none
Serenity Wheeler (Shizuka Kawai) - none
Maximillion Pegasus (Pegasus J. Crawford) - Sapphire Pegasus

GX:
Jaden Yuki (Judai Yuki) - Alex Yuki
Chazz Princeton (Jun Manjoume) - none
Syrus Truesdale (Sho Marufuji) - Mahad Truesdale
Bastion Misawa (Daichi Misawa) - none
Zane Truesdale (Ryo Marufuji) - none
Atticus Rhodes (Fubuki Tenjouin) - none
Alexis Rhodes (Asuka Tenjouin) - Alex Yuki
Blair Flannigan (Rei Saotome) - none
Dark Magician Girl (Black Magician Girl) - Mahad Truesdale

5D:
Yusei Fudo - none
Jack Atlas - none
Crow Hogan - none
Tetsu Trudge (Ushio) - none
Leonard "Leo" (Lua) - none
Luna (Luca) - none
Akiza Izinski (Aki Izayoi) - none
Carly Carmine (Carly Nagisa) - none

If you want one not on the list just ask and I'll add it.