Nanto Suicho Ken

Rei's style. Nanto Suichō Ken (南斗水鳥拳, South Dipper Waterbird Fist, also translated as Swan Fist or Waterfowl Fist) is the most graceful of the Nanto Seiken styles. With a focus on grace and aerial attacks, its primary usage is for close-range attacks. Like many other Nanto styles, it uses the hands or air pressure to split the body into pieces.

Techniques

Techniques listed alphabetically (omitting the redundant word "Nanto").
㊙ = An "Ōgi" (奥義 secret) technique.

Danko Sōsai Ken (断己相殺拳, "Self-Sacrifice Offset Fist") ㊙

The ultimate Suichō Ken technique. A technique that kills an opponent at the expense of the user. It would've killed Raoh if it had actually been used successfully.

Hien Ryūbu (飛燕流舞, "The Flowing Dance of the Flying Swallow") - Rei performs this technique in a demonstration in front of other Nanto students, leaving them impressed and Yuda angry. It earned Rei the envy of Yuda.
Hishō Hakurei (飛翔白麗, "Soaring White Loveliness")㊙

A jumping mid-air double stabbing attack which serves as the killing blow that defeated Yuda.

Nanto Ko Ha Ryū (南斗虎破龍, "South Dipper Tiger Destroys Dragon") - A technique Rei performs after witnessing Kenshiro's Seikyokurin stance. It causes its target to fall into a state of false death. Rei performs this technique in conjunction with Kenshiro's Hokuto Ryū Geki Ko ("North Dipper Dragon Attacks Tiger") to deceive the Fang Tribe.
Komen Yu (湖面游 Lake Surface Swimming) ㊙
Mugai Setsuei Shō (無外絶影掌 "Stopping shadow palm outside nothing") ㊙

Used on Rima

Suzaku Tenshō (朱雀展翔, "Expansive Flight of the Red Sparrow") - A face-cutting technique Rei uses against Yuda. Unnamed in the original manga, named in the anime series.
Yōsō Sankaku Kyaku (鷹爪三角脚, Hawk Talon Triangle Kick) - A Nanto Seiken technique used by Amiba, a former Nanto student. An off-the-wall jump kick. Amiba's Nanto Seiken style is never given a name in the original, however in the spinoff Rei Gaiden it is revealed he was a student of Nanto Suichō Ken.
Zanchō Zan (残鳥斬 Remnant Bird Cut) ㊙