|Real name||Kurai Yuki|
|Age|| 21 (Trials of Darkness)|
24 (Legend of the Dragons)
|Occupation|| Professional Duelist|
Student of Duel Academy (formerly)
|Appearances|| Trials of Darkness|
Legend of the Dragons
Duel Academy Chronicles Trial by Shadows
|“|| I love my siblings, but sometimes Jaden can get a little annoying...|
– Kurai Yuki
Kurai Yuki is a Professional Duelist, a former Obelisk Blue and the elder brother to Jaden and Reina Yuki. He duels with a "Kamen Rider Deck" and his Duel Spirit is "Kamen Rider Siren".
During his second year of Duel Academy, Kurai's best friends, Atticus Rhodes and Brooke Rivers (also his crush), along with several others, went missing when they were given the impression to take a duel exam. That was the last time Kurai ever heard of them and during the year they weren't around, he worried sick.
After graduating, Kurai rented an apartment in Domino City and began his journey as a Pro Duelist alongside Zane.
Kurai is tall young man with spiky brown hair-styled like Jaden's but much spiker-and bronze tips, golden-brown eyes and tanned skin. Kurai wears a long white coat with blue outlines over a black longs-sleeve shirt, dark pants and shoes. He has his black deck case attached to his belt under his jacket and wears an Academy Issued duel disk on his left arm.
Kurai has a normal older brother-like personality, he loves his younger brother and sister, but like most older brothers, can get annoyed with them sometimes. Unlike Zane with Syrus, he encourages Jaden and Reina to become stronger duelists. He is protective of his younger siblings if he finds out that they've have been harmed in any way. He wasn't like most Obelisks, he respected everyone in every dorm, and he encourages people to be the best duelist they can. He commands respect and authority. He also respects his cards and cares for them greatly.
He has a brother-sister like bond with his Duel Spirit, Kamen Rider Siren, who often teased him about his crush on Brooke. When around Brooke, Kurai was known to become flustered and become very nervous.
- Duel Spirit communication: Kurai is able to see and see Duel Spirits.
- Dueling proficiency: Kurai is very skilled at dueling, having been one of the top students at Duel Academy. He is able to work with anything he has on hand.
- Protective of siblings: Kurai is very protective of his brother and sister.
- Brooke Rivers: Due to his crush, Kurai was know to become flush whenever he came into contact with Brooke.
- Duel disk
Kurai was born to Arata and Cori Yuki as their eldest son and child and the older brother of Jaden and Reina. Growing up, Kurai pretty much hated his parents, yet loved them all at the same time. Eventually, when he was able to, he signed up to attend Duel Academy, there, he became friends with Zane Truesdale, Atticus Rhodes, and Brooke Rivers.
During his second year of Duel Academy, Kurai's best friends, Atticus Rhodes and Brooke Rivers, along with several others, went missing when they were given the impression to take a duel exam. That was the last time Kurai ever heard of them and during the year they weren't around, he worried sick.
During his third and final year, he along with Zane, his brother and sister, and others were selected to guard the Spirit Keys to prevent the Sacred Beasts from coming. Kurai dueled against Brooke, who at the time was under the name of Ice Mistress, but freed her from Ice Mistress' control, thus freeing her.
Kurai doesn't appear until the end standing by Zane as he too was taken to the World of Darkness, his fear losing his siblings.
Kurai duels with a "Kamen Rider" Deck based on a group of heroes - a deck that he made using a "Create an Archetype" back when he was young. Unlike Jaden's "Elemental Heroes" and Reina's "Gem-Knights" involving fusion, his does not.
- Kurai was originally named Hayden.
|The Ties That Bind series|