Tsukiko Sūdoku

**Tsukiko Sūdoku** (数独 月子, Sūdoku Tsukiko) is the 3rd Seat of the 5th Division, formerly under Captain Sōsuke Aizen and currently under Captain Shinji Hirako. She is the older twin sister of Hoshiko Sūdoku.

## Appearance

Tsukiko has long curly, red hair that is tied up in a ponytail. She has brown eyes and a light purple, crescent moon-shaped hairclip on the left side of her hair. She also wears the standard Shinigami robes. During her time as a member of the 12th Division, she wore a laboratory coat over her Shinigami robes and a pair of light purple, oval glasses. Ten years after the defeat of Yhwach, Tsukiko's hair has grown longer.

## Personality

Tsukiko is more calm and level-headed than her twin sister, Hoshiko. She tends to be more empathetic towards others than her sister is, first evident when she shows understanding towards Momo Hinamori's condition after Aizen is revealed as a traitor. She was later quick to make an attempt to stop him from leaving after realizing the harm he caused Momo. She also tends to keep her sister in check when Hoshiko decides to do something out of hand, though occasionally joins in on her sister's antics. Ichigo Kurosaki notes that Tsukiko has a more authoritative personality that resembles his sister Karin, but less outspoken.

Aside from leading her division in the absence of Aizen and the hospitalization of Hinamori, Tsukiko is president of the "Shinigami Puzzles Club", with her sister serving as vice-president. However, they do not have many members. The only other known member of their club has been 10th Division captain, Tōshirō Hitsugaya, while they try - albeit unsuccessfully - to bribe Ichigo into joining their club. They both like sugar cookies, though Tsukiko prefers the ones that are shaped like a crescent moon. The twins often bake some for their club, but the cookies are usually gone before they can offer any to Ichigo, having been eaten by 11th Division lieutenant, Yachiru Kusajishi.

## History

Tsukiko and Hoshiko were originally seated officers of the 12th Division and researchers of Shinigami Research and Development Institute, but transferred to the 5th Division because being members of the 12th Division meant having to witness more weird experiments from their captain, Mayuri Kurotsuchi. They also felt that staying at the 12th Division would result in them being ridiculed because of their red hair color and they wanted to prove that they were worth more than their appearance. Despite having left the 12th Division, it is clear they still enjoy science and often volunteer to assist Akon in his work, given that Mayuri is not present.

## Powers & Abilities

**Keen Intellect**: Being a former member of the 12th Division, Tsukiko is highly competent in research. Alongside her sister, she also assists Akon, an expert scientist, in his work regularly.

**Swordsman**: As a Shinigami and a seated officer, Tsukiko possesses some level of skill in swordsmanship.

**Shunpo Practitioner**: Alongside her sister, Tsukiko has enough skill in Shunpo to appear before her former captain, surprising him, before the latter's retreat to Hueco Mundo.

**High Spiritual Power**: As a 3rd seat in the Gotei 13, Tsukiko has a high amount of spiritual power.

**Zanpakutō**

Tsukiko's sealed Zanpakutō takes the form of a katana with a light purple, crescent moon-shaped guard.

* Shikai: Not Revealed
* Bankai: Not Yet Achieved

## Trivia

Tsukiko is five minutes older than Hoshiko.