- Stage Name: Nachu (なちゅ)
- Real Name: 竹川奈津子 (Takekawa Natsuko)
- Nickname: なちゅはむ (Nachuhamu)
- Birthdate: December 23, 1984
- Blood Type: O
- Height: 161cm
- Bust: 88cm
- Waist: 61cm
- Hips: 85cm
Singles B-sides Participation
- Kodoku na Runner
- Eros no Trigger (Undergirls A)
- Awajishima no Tamanegi (Undergirls B)
- Abazure (Undergirls B)
- Gamjatang Bojou (Undergirls A)
- Uekara Natsuko (Undergirls B)
- Owaranai Encore
- Specialist in MC
- She can dance 300 Para Para songs.
- Nachu is so far the only SDN48 member (excluding the AKB48 to SDN48 Girls) to appear in an AKB48 Single, as well as the first one appearing in their TV Shows.
- Originally an Under girl, Nachu became a First Generation member with Tezuka Machiko, Kohara Haruka, and Kaida Jyuri on May 10, 2010.
- In the DVD release of SDN48 1st Stage "Yuuwaku no Garter", she showed a talent of impersonating some of her fellow team members by voice.