Karin Asaka

"'The Splashing Waters, Blue Witch!'""-roll call""'Wielding The Powers Of Ancient Water, Ancient Blue Witch!'""-second roll call"Karin Asaka (朝香果林) is Blue Witch of the Nijimen. She wields the power of water.

Personality
Karin is charismatic, mature and very much a flirt, seducing men and women to her advantage. While trying to act cool, she is sometimes a bit of a goofball, making her the team's gag-maker.

Backgound
Karin's father was the leader of Nijitipia's Water Nijis. A year after she was born, she and her mother were forced to flee into the human world when the Darktopian Buccaneers invaded Nijitopia, leaving her father behind to fight the space pirates and gets killed. Karin is a little aware of her Nijitopian heritage and only has few memories of it.

At a young age, Karin began to seduce people to get what she wants. Though her mother warned her not too get carried away, Karin ignored her warning, not knowing the consequences. Sometime after starting her first year at Nijigasaki Girls High School, Karin flirted with a man, who happens to be a Yakuza, who attempted to kidnap her until Kanata saved her. Karin vowed to never flirt with someone ever again. It was then her mother gave the Water Niji Diamond.

She is the last to become a Nijiman. In Chapter 6, Karin was hesitant to accept her Nijitopian heritage, fearing that her seductiveness will lead the Nijimen until Ayumu convinced her that she shouldn't be afraid of being a playgirl and that her seductiveness can be useful. Because of that, the Water Niji Diamond made Karin transform into Blue Witch and then summoned Niji Water Siren to form the Mahou Gattai Niji Sentry to defeat Pirate Womanizer.

Karin and Kanata have a strong rivalry against each other, causing the Nijimen's teamwork to be disrupted. In Chapter 7, Karin's mind gets switched into Kanata's body. She is then remembered that Kanata saved her life before and decides to be even with her. After returning back to her own body, Karin's rivalry with Kanata continued on, much to the dismay of Emma.

In Chapter 26, Blue Witch becomes Ancient Blue Witch.

In Chapter 31, when all of her teammates get hypnotized by Pirate Siren's song, Karin needed to make a stronger song to save her teammates and defeat the space pirate. She then uses the song created by her father to defeat Pirate Siren and save her teammates.

In the final battle, Karin is the third person to get killed. While in purgatory, Blue Witch fights Pirate Siren and returns back to the real world to help Ayumu defeat Dark Warlock Captain Erebus. After the battle, Karin enrolls at a fashion model university in America.