Anna is Yoh Asakura's fiance a kuudere. She is an itako or a spirit medium in English. She is described to be very clever and hates humans at first. Her special ability is channeling spirits even from heaven. She "tortures" Yoh in summer in order to win the Shaman Tournament and she also wishes to be Shaman Queen. She is also very powerful despite of her looks.
After being abandoned by her birth parents due to her abilities, Anna was adopted by Kino Asakura.
Aggressive and decisive, Anna is a pragmatic person who, to most, appears cold and harsh. However, she has shown that she genuinely cares for those important to her, especially Yoh, and merely is dedicated to be "the ultimate Shaman Queen" and wife to Yoh, the first real friend that she ever had in her life. She holds a deep gratitude for Yoh for saving her life that's why she thinks it's her responsibility as Yoh's Wife to train him hard to make his dream come true to be the Shaman King (though she tells Yoh and the others that it's for her own dream).
Anna's spiritual strength is shown as she was able to seal in Hao Asakura's guardian spirits (called as shikigami)- Zenki and Kouki, and was able to control them. Anna and Hao seem to have an odd relationship of their own - Anna detests Hao and even slapped him once. Surprisingly, he was not angry, but actually seemed amused. It has also been hinted that Anna is the reincarnation of the original Asakura Hao's mother from 1000 years ago, Asano-Ha; others think that Hao possibly had feelings of his own for Anna and wanted her for himself. It is obvious that Anna loves Yoh, despite how badly she seems to treat him - she said it when Yoh fought the oh-oni to save her, once to his friend Manta Oyamada, and again to Silva, a commissioner for the Shaman Fight. She broke down crying when she thought that Yoh was about to be killed while being possessed by Tokagero. Anna can be extremely possessive of Yoh, beating him up once when she thought that the Oracle Bell he brought home was a woman's pager. She also reacted jealously when Yoh asked Tamao Tamamura to cook him a meal in the anime. When Yoh was thought to be dead after Hao stole his soul, Anna was in hysterics, and only recovered her strength when Yoh returned. Anna attends Shinra Private Academy along with Yoh and Manta. Her favourite singer in the manga, Ringo Awaya, is a reference to Japanese singer and guitarist Shiina Ringo.