For other forms of Seina, see Seina (disambiguation).
Seina Yuki
Personal data
Age 16 (Season 2)
17 (Season 3-4)
Gender Female
Species Human
Deck "Gem-Knight"
Occupation Student of Duel Academy
Morality Good
Living status Alive
Additional info
Star sign Sagittarius
Place of origin Domino City, Japan
Residence Domino City, Japan
Ethnicity Japanese
Nationality Japanese
Hair color Light brown
Eye color Green
Skin color Average
Height 5'2" (Season 2)
Relatives Kojiro Yuki (step-father)
Aki Yuki (mother)
Jaden Yuki (paternal step-brother)
Partner Gem-Merchant
Affiliation Yuki family
Powers and skills
Powers Duel Spirit communication
Skills Dueling proficiency
Equipment Duel Disk
Production notes
Created by PrincessAnime08
Appearances Chaos of The Light
My brother may not be smart in the learning area, but he excels in the dueling area!
Seina Yuki

Seina Yuki is the younger half-sister of Jaden Yuki and a first year Obelisk Blue student of Duel Academy. Seina duels with a Gem-Knight deck with her main duel spirit being Gem-Merchant.

Physical description

Seina is very slim with a petite build; she has she has long reddish-brown hair with streaks of pink, and amber-brown eyes. She wears the normal Obelisk Blue girl uniform, but with a pair of shorts underneath.




  • Duel Spirit communication: Seina has the power to see and talk to Duel Spirits. 


  • Dueling proficiency: Seina is a skilled duelist, able to work with anything she has on hand.
  • Adaptability: Seina able to quickly adapt and change her current plan if needs be.
  • Normal level intelligence: Seina is smart in her own way, and does what she can to turn in her homework on time.


  • Not willing to get close: Recently, Seina has began to distance herself from her brother, reasons unknown to him and everyone else.


  • Academy issued Duel disk


Seina was born to Kojiro Yuki and Aki Yuki shortly after her father was left with a newborn Jaden.

However, i t's later revealed that she is not the child of Kojiro and Aki. She is only the daughter of Aki and Kojiro's step-daughter making her Jaden's step-sister.


Seina runs an Gem-Knight Deck. Like Jaden, they involve the usage of their own version of Polymerization, Gem-Knight Fusion, to create stronger monsters.


  • Seina was originally named Reina
The Ties That Bind series
Caline Alvarez
Carson Alexander