Wentz Eiji is a singer, actor and songwriter; and a member of the duo WaT, along with Koike Teppei. He is of German/American decent through his father and Japanese through his mother, though he does not speak German or English.
- Name: Wentz Eiji (ウエンツ瑛士 - "Wentz" is the family name)
- Birthdate: October 8, 1985
- Birthplace: Tokyo, Japan
- Blood Type: O
- Height: 170cm
- Weight: 55kg
- Was a Model at age of four.
- Started out acting with the role of Chip in the Four Seasons Musical Troupe Production of Beauty and the Beast.
- Became famous as a child actor for becoming a regular on the NHK's television show "Tensai Terebi-kun".
- Wentz Eiji, who is said to get his handsome looks from his German-American father, is widely known as "the half-American who can only speak Japanese." It is known that he is the only member of his family that can't speak English.
- His mother knows English because she's married to an American. His brother knows English because he had a English tutor. So whenever his parents get mad at him and they speak in English, he doesn't even know they're mad at him.
- Already being known as a child actor, he started to stand out again when he was on variety shows in 2005. Despite his handsome looks, because of his spirited personality he was considered a young upcoming comedian.
- Wentz says he loves Yamazaki Housei, a very famous comedian. Because it's a fact they starred in "Tensai Terebi-kun" together. In a episode on November 21, 2005 of Hey! Hey! Hey! Music Champ, Yamazaki said "he was the first person to respect me."
-  Kyuumei Senshi Nano Seibaa
-  Toshiie to Matsu (利家とまつ)
-  Tantei Kazoku
-  Gokusen (Episode 6 only)
-  Lion Sensei (ライオン先生)
-  Fukiko Hemingu no Kiseki
-  Aa, Tentei Jimusho
-  Tadashii Renai no Susume (正しい恋愛のススメ)
-  Rondo
-  Nodame Cantabile SP
-  Kamen Rider THE FIRST (仮鿢ライダー THE FIRST)
-  Seiyuu (Voice Acting): Brave Story (ブレイブ・ストーリー)
-  WaT My Favorite Girl the movie
-  "Gegege no Kitaro"