Blue-Eyes White Dragon was the monster ka spirit of Kisara, although it only emerged while she was in an unconscious state.
With Kisara captured, Aknadin heard of the Dragon's power and hoped to transfer the ka to his son Seto, unconcerned that this would mean killing its current host. The imprisoned Kisara was unaware of her ka and thus unable to summon it. Seto, disgusted at the idea of using her without regard to her life, attempted to save her. He failed, and both their lives fell into danger. However, Kisara lost consciousness, causing the White Dragon to emerge and ultimately resulting in their rescue.
Seto had come to care deeply for Kisara during this time. He defended her until her death at the hands of Aknadin, who proceeded to possess his son. Perhaps showing that she felt the same about him, Kisara's spirit entered Seto's mind and destroyed Aknadin, freeing the young priest. Afterwards, Seto extracted the White Dragon ka and used it to fight Zorc Necrophades.
According to Takahashi, Seto's feelings for Kisara are the reason behind Seto Kaiba's modern-day obsession with the Blue-Eyes White Dragon.
Yu-Gi-Oh! Duelist Manga
Yu-Gi-Oh! Duel Monsters (Anime)
Duelist Kingdom arc
He is used in battle by Seto Kaiba in his first Duel with Yugi Muto. Then he ised again in a second duel to fight against Yugi Muto. Then he is used in a duel to fight against Maximillion Pegasus.
Legendary Heroes arc
He is used in battle to fight against the Big Five.
Battle City arc
He is sued in battle to fight against different duelists.
Vitrual World arc
He is used in battle to fight against the Big Five, and Noah.
Battle City Finals arc
He is used in many battle to fight against Ishizu, and Yugi Muto.
Grand Championship arc
He is used in battle to fight Zigfried.
Capsule Monsters arc
He is set free by Yami Yugi, through a stone tablet. Then he is fused with Yami Yugi, when he and the others are trap in the Capsule Monsters world.
Dawn of the Duel arc
He is used in battle to fight against Yami Bakura and Zorc.
Pardox mentions that he has stolen the Blue Eyes White Dragon Card from Seto Kaiba. This shocks Yami Yugi and Yugi Muto the most.
Red Eyes Black Dragon
- This creature is not voiced by anyone in the Anime.
all information on Blue Eyes White Dragon (Character) came from http://yugioh.wikia.com/wiki/Blue-Eyes_White_Dragon_(character)