Atem Asakura

Atem (アテム, "Atemu") is a living within the. He was once the Vice Captain of the and left prior to Vice Captain  rising to the position to replace him. He was known as an honor bound man while he was in his position and he always did things by the book, this led to him being known as the Kōkiōji (高貴王子, "Noble Prince") by his subordinates.

Childhood
Atem had died young and spent most of his life in the Soul Society where he was raised by an elderly couple, the very same that raised his unnamed brother. He lived in the Junrinan of the West Rukongai and was there for many years up until when His brother caused the lightning strike, which took out most of the 1st Rukon and set many homes ablaze, it was then his adopted parents sent him to the shino academy to study and become a shinigami as well as to look out for his brother.

Time in Shinō
While in Shino he met and befriended his teacher, Shōyō Shakyamuni and was taught a great deal from him, and under him at a young age Yue gained the power to call forth his zanpakutou a short Wakizashi with a blue wrapped hilt with intricate white patterns on it; He didn't learn his zanpakutou's name until graduation and he heard its spirit call out its name which was Chōtame and he finally saw its spirit as a carefree female clad in a school girls uniform and pink hair.

Recruitment into the Third Division
Shortly after graduation, Chōtame was drafted into the Third Division by Captain and after about two years he was promoted to eighth seat of the division, a few years after he moved up to fifth seat. During his time with the third division he learned how to communicate with his zanpakutou spirit and finally learned how to control it thus allowing him to learn its techniques which also marked the day that his captain saw his potential.

Promotion to Vice Captain & Departure
After he learned his zanpakutou's true power he was able to be promoted again, this time to Vice-Captain which pleased him. He strives to be captain by trying to learn his bankai in the time hes vice-captain, wanting to be the captain of the ninth division but this is short lived as the spot vacated by Captain Madara Kawahiru was filled by another Kawahiru by the name of Sengetsu which angered him greatly as just before that happened he was on the verge of obtaining bankai. He subsequently quit trying to obtain his bankai claiming that his efforts were for naught and when he discovered his brother had defected he went searching for him.

Powers and Abilities
Immense Spiritual Energy: His spiritual pressure has been noted to be able to change the temperature in an area when he is angered, this level of power was abnormally high for a vice captain level shinigami at the time, but since he has not earned his bankai yet, even with this he could not reach captains level.

Tactician: He has also shown himself as a powerful and flexible tactician, capable of adjusting seamlessly to any given combat situation, if not plan out events well in advance. He understands the strengths, weaknesses and mannerisms of his enemies and creates strategies to achieve victory. Though it can be said that the majority of his tactics rely heavily on his speed, making it easier for one to attack.

Shunpo User: He is very well versed in the use of Flash Steps and can out maneuver most users of this technique only being beaten by the Goddess of Flash herself, Seireitou Kawahiru, and His Brother. During his time as Vice Captain, He was always first on the scene for battles and used his speed as an edge in dealing damage quickly.

Master Hand-to-Hand Combatant: He is a very proficient hand-to-hand combatant, possessing considerable masterful skill using it as his primary means of attack in conjunction with his shikai. Equally lethal using punches and kicks as well as being highly unpredictable. His fighting technique is incredibly destructive using his speed and reflexes to quickly take out his opponents. He is skilled enough to even hold his own against stronger opponents for short amounts of time.

Kido Expert: Atem is highly proficient in Kidō and is capable of performing high-level Kidō spells without the incantation. For example, during his battle with Chōtame, he used a level 63 binding spell without the incantation

Zanpakutō
Chōtame (蝶為, "Butterfly Effect") is the name of Atem's Zanpakutō and when sealed takes the form of a Wakizashi with a blue wrapped hilt and a golden crossguard that is shaped in the form of a pair of butterfly wings. The blade is accented with runes which state "Chaos can not be controlled." When not in use he keeps this under his uniform similarly to that of his former captain so that it is not visible.
 * : To release he utters the phrase "Change" (異状, "Ijō") to which his blade resonates for a brief moment and then doesn't change in its overall appearance.
 * Shikai Special Ability: According to Atem his blades power is best explained as the Butterfly Effect as its powers, conditions and function change based on his opponents actions, thoughts and decisions.

Trivia

 * His name was inspired by Pharaoh Atem aka Yami Yugi from the Yu-gi-Oh! series.