Ahem's daughter, the water spirit. Centuries ago she was engaged to Ongo until he became evil and they were split up. Then in 2009,Rongo spotted Ongo in Tokyo with Mii. Believing Mii had taken the form of a 10 year old and taken Ongo for herself,Rongo took over the body of Natsumi's friend Nami,and tried to remove her skull necklace only to receive an electric shock.   Then upon doing a dance, Rongo showed herself and attacked Natsumi with water, and when Ongo showed up, Rongo was horrified that he didn't remember her. So Rongo challenged Natsumi to a duel and, after almost shooting a fighter jet down with jets of water, Natsumi tried to stop Rongo, but due to interference by Ongo, Rongo was transformed into a smaller child version of herself. Only then did Ongo remember her. Having lost her powers, Rongo requested to stay with Natsumi.   When Ongo became evil and giant again, Rongo tried to stop him, but eventually she left it up to Mii. Rongo's powers include being able to control all forms of water. 

After meeting a dancing old man in what she thinks is just a crazy dream, a preteen schoolgirl embarks on a series of fanservice-filled magical girl adventures with a little creature named Ongo who might be evil and a shy girl with mysterious powers named Nami.
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(Source: Anime News Network)

[Website (WMG)](https://wmg.jp/shimamotosumi/) | [Wiki (JP)](https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%9C%AC%E9%A0%88%E7%BE%8E)

A Japanese actress, voice actress and narrator of film, anime and video games. She is currently independent of any talent management company.

After graduating from the Toho Gakuen College of Drama and Music, she joined Gekidan Seinenza, a theatrical acting troupe. Her best-known voice roles include [Nausicaä](https://anilist.co/character/539/) in [Nausicaä of the Valley of the Wind](https://anilist.co/anime/572/), and [Kyouko Otonashi](https://anilist.co/character/4745/) in [Maison Ikkoku](https://anilist.co/anime/1453/).

She won the role of Nausicaä as she had played [Clarisse](https://anilist.co/character/11236/) in [The Castle of Cagliostro](https://anilist.co/anime/1430/) and impressed Hayao Miyazaki.

She is married to Daisuke Koshikawa, one of the founders of the comedy troupe Chibikko Gang. Their first child, [Shiori Koshikawa](https://anilist.co/staff/185752/Koshikawa-Shiori), has also done voice acting.

(Source: Wikipedia)

Non-anime roles:
~!Gon in "Aedis Eclipse: Generation of Chaos" (VG)  Kojiro in "Brave Fencer Musashi" (VG)  Laharl in "Disgaea: Hour of Darkness" (VG)  Lola in "Grim Fandango" (VG)  Mikey in "Radiata Stories" (VG)  Pat in "Galerians:Ash" (VG)  Red in "Fraggle Rock"  Ryoko Leingod in "Star Ocean: Till the End of Time" (VG)  Silva in "Suikoden V" (VG)  Spike in "Ape Escape: Pumped & Primed" (VG)  Voice of Rita Repulsa in "Mighty Morphin' Power Rangers" (TV)  Zeldalia in "Atelier Iris:Eternal Mana" (VG)!~