Ren Kaidou

"'Shine, Rainbow Light!'"Ren Kaidou while using her Zanpakuto Ren Kaidou is a human which has mermaid and shinigami powers she's a friend of Rim Eun Hye and classmate of Lala Kitaoji, Hibiki Kitada and male quincy, Leon Kurosawa.

Appearance
Ren is slender, tall, blue-colored short hair and red eyes also pale skin. At school, she wears Prism Academy with red blazer, white shirt, blue necktie, red skirt with belt and wears white socks with green line and brown boots.At home, she often wears t-shirt with colorful border, yellow buttons with 'Bermuda' printed, a pair of shorts and orange sneakers.

In Rainbow Society arc, she wears her typically shinigami uniform, she carries her zanpakuto, Rainbow Light (虹の光 Niji no Hikari) at her waist.

Personality
Ren is tomboyish girl, however, she's kind and loves to help others in difficult situations, such as rescues Hye from being executed. She values points such as heroism, and people who value others over themselves.

She loves to sing, she often sings at the school rooftop at recess time.

History
Ren was a mermaid idol from Magallanica seas that possesses a beautiful voice that spreads out like a wave, one day, she was assigned from the queen of mermaid to live in human world, her previous name is Akari Shimura.

She was stranded at a beach at her human form, she was found by the Kaidou family and adopted her and raise her as their child.

Powers & abilities
Expert Hand-to-Hand Combatant: Ren has been trained in martial arts since she was adopted, both professionally and by her father. She has repeatedly shown great agility and coordination in her attacks. In addition to having powerful kicks and punches, Ichigo is proficient in counterattacks, takedowns, and body locks. She has repeatedly caught an opponent's weapon strikes with a single hand. She effortlessly defeats multiple bullies and gangsters on a regular basis, and is a better martial artist than Tatsuki Arisawa, who is ranked the second strongest girl in all of Japan despite her fighting with a broken arm. She effortlessly knocked out three lieutenants in rapid succession, while bare-handed, with a single strike each. While she has stopped training, constant attacks from bullies and his father keep his skills fresh.

Enhanced Strength: Even while not in her Shinigami form, Ren is deceptively strong, smashing a man's head through a concrete road with a single kick and later kicking Uryu Ishida from her bedroom into the street without injuring his leg from the man's Hierro.

Enhanced Speed & Reflexes: Ren is a very fast and agile fighter. Ren possesses great reflexes, dodging a strike with no wasted effort and immediately counterattacking. She can strike quickly, without warning, and in rapid succession. Her speed allows him to follow the movements of faster opponents to better analyze their movements, and block otherwise fatal strikes.

Shinigami and mermaid abilities and powers
Master Swordsman: In terms of fighting style while in her Shinigami form, Ren relies mainly on swordplay. Aside from her initial training with Ichigo, he is essentially on a "learn as you go" training regimen; thus, her skill has developed by fighting rather than formal instruction, becoming even more capable with every fight. Her overall skill allows him to fight evenly against sword masters of Byakuya Kuchiki and Kenpachi Zaraki's caliber. While usually fighting right-handed, Ren appears to be ambidextrous, as she is proficient in wielding Zangetsu in his left hand.

Voice: She has beautiful voice from her mermaid form, in her shinigami form, she able to attack her opponents by screaming loudly.