- Name: Satake Koki (佐竹滉輝)
- Birthday: 1990.04.10
- Blood Type: O
- Zodiac sign: Aries
- Birthplace: Hyougo Prefecture, Japan
- Admired senior: Yasuda Shota of Kanjani8 and Akanishi Jin of KAT-TUN
- Instrument: Guitar
- Joined JE: 2004.02.21
- Used to belong to the baseball team for his school.
- Went to kindergarden with fellow member Senzaki Ryota.
- Was a member of the baseball group J2000 for Johnny's.
- In 2006 he was a backdancer for KAT-TUN's debut tour Real Face.
- Is friends with Yasuda Shota from Kanjani8 and has a very close friends with Muro Ryuta from BOYS.
- December 2008 he decided to left the agency.