Eiko Koike (小池栄子 Koike Eiko) is a Japanese actress, television personality, and former gravure idol. She is best known for her strong woman persona but can also play other roles when acting. She was as a commentator for Japan's PRIDE Fighting Championship from 2000-2006. She married professional wrestler Wataru Sakata on August 29, 2007 and has supported him in his matches for HUSTLE wrestling. She is currently represented by Yellow Cab talent agency.
- Koike is left-handed.
- She almost drowned as a young child and because of this she has a fear of water.
- She is friends with actress Shin Yazawa from high school. The two appeared together in the 2007 Fuji TV drama, Yama Onna Kabe Onna.
- Name: Eiko Koike (小池栄子 Koike Eiko)
- Birth date: November 20, 1980
- Birthplace: Setagaya, Tokyo, Japan
- Blood type: AB
- Height: 5' 5" (166cm)
- Measurements: B: 36" (91cm) W: 23" (59cm) H: 34" (87cm) DD-Cup (F JP/EU)
- Hobbies: Watching movies
- Favorite color: Black
- Specialties: Dance
-  Samurai Girl 21 ... Makoto
-  Man-hole ... Takako
-  Mohohan: Copycat Killer ... Akemi Kishida
-  2LDK ... Nozomi
-  Love Collage ... Aya
-  Nasu: Andalusia no Natsu ...Carmen Pascual / Dominguez (voice)
-  Kamikaze Girls ... Akimi
-  Dogs & Cats
-  Yaji and Kita: The Midnight Pilgrims ... O-Hatsu
-  Otoko wa Sore wo Gaman Dekinai ... Cherry
-  Wool 100% (2006) (voice) ... Narration
-  Deru Toko Demasho!
-  Seppun
-  Paco and the Magical Picture Book
-  Dollhouse ... Natsuki
-  Sui 10! One-Night R&R
-  Yoshitsune ... Tomoe-gozen, Yoshinaka's concubine
- [2005[ Tetsuko no Heya 30-nen Special ... Herself
- [2006-2007] Nikkei Supesharu Kanburia Kyuden ... Herself, Co-host
-  Yama Onna Kabe Onna