- For other forms of Seina, see Seina (disambiguation).
|Real name||Seina Yuki|
|Age|| 15 (Season 1)|
16 (Season 2)
17 (Season 3)
18 (Season 4)
|Occupation||Student of Duel Academy|
|“|| 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.
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 runs an Gem-Knight Deck. Like Jaden, they involve the usage of their own version of Polymerization, Gem-Knight Fusion, to create stronger monsters.
|Trials of Darkness series|