Yu-Gi-Oh! D.N.Action!

'''Yu-Gi-Oh! D.N.Action!''' is a spin-off of the Yu-Gi-Oh! anime series. It takes place before Yu-Gi-Oh! HEARTZ.

Summary Sypnosis
Syrus Truesdale becomes a star of the Cyber Art Pro League, along with his brother, Zane Truesdale. Until one day, during a visit to the KaibaCorp, Syrus gets himself into a shocking accident that fuses his DNA with the DNAs of the legendary duelists of different eras and dimensions: Yugi Muto, Jaden Yuki, Yusei Fudo, Yuma Tsukumo, Yuya Sakaki, Yusaku Fujiki, and Yuga Ohdo, which gives him the strength, speed, agility, and the dueling skills and strategies of these dueling heroes! Now, with his life turned upside down, not only is Syrus Jaden's new and genetic brother, but it'll be his turn to become a hero and save the world from new threats with his new skills, a new deck along with a new duel disk, and also learning how use a new summoning duel ability called DNA Summon!

However, Syrus won't be doing it along as there will be some new friends and new monsters to add to his deck along his way, while he still has a lot to learn how to use his new abilities and how to use the new summoning skill.

Main
Syrus Truesdale (Yuki)/Sho Marufuji (Yuki)

The main character who now works for the Cyber Art Pro League with his older brother, Zane, until during a visit to KaibaCorp, a shockwave accident occurs in Syrus that causes his DNA to be infused with the DNAs of the eight duel heroes. Since he has all eight of the DNAs combined with his DNA, including Jaden's DNA, Syrus becomes the genetic brother of them and learns that will have to use his new abilities, intelligence, and skills of those duelists to protect his friends and the world from evil, like the Master of Dark Jumpstart, Master Obsidus. His ace monster is the Jumpstart Mecha Dragon and his spirit partner is Junkuriboh.

Zane Truesdale/ Ryo Marufuji

The older brother of the main protagonist who is the Cyber Art Pro League until his heart problems caused him to be weakened because of his deck that is now owned by Syrus. When he and Syrus were kids, he gave a copy of his Power Bond card to him but told him to not use it for play which made Syrus develop a lack of confidence until their year at Duel Academy, Syrus had managed to prove Zane wrong by becoming a stronger duelist thanks to Jaden Yuki, who was soon the genetic brother of Syrus in the future after Syrus had his DNA fused with his, along with the other DNAs of the six legendary duelists. Although his younger brother's DNA is infused with the legendary duelists' DNAs, including Jaden's DNA, he still remains as Truesdale.

Supportive Characters
Jaden Yuki/Judai Yuki

A famous Slifer Red duelist who graduated from Duel Academy like Syrus and their friends, and is now a world traveling duelist who is thriving to be the next King of Games like Yugi Muto. He was an only child, but after Syrus had his DNA fused with his DNA, along with the other DNAs of Yugi, Yusei, Yuma, Yuma, Yusaku, and Yuga, he becomes the genetic other brother of him. His ace monster is the Elemental HERO Neos and his spirit partners are Winged Kuriboh and Yubel, who is fused with Jaden after their duel in another dimension.

Yugi Muto

The King of Games, as people like to call him, and the first legendary duelist in history. He carries the Millenium puzzle that his grandfather gave him to unlock that transforms him into the Yami version of himself when he is challenging someone in a duel. His ace monster is the Dark Magician and his spirit partner is Kuriboh.

Villains
Master Obsidus The main antagonist who plots to use Dark Jumpstart Monsters to take over both the Duel Monsters Spirit world and the human world, but his plans are always foils by Syrus and his friends, who won't stop at nothing than to duel his minions and their own Dark Jumpstart duel monsters.