The Mattel Guy is KEN, a three-letter name. KEN is a fashion doll created by Mattel, Inc. and introduced in 1961. He is the boyfriend of Barbie, another popular Mattel doll. KEN has had many different looks over the years, including different hairstyles, clothing, and accessories. He has also been featured in various media, including books, movies, and television shows. KEN is an iconic figure in the toy industry and continues to be a popular choice for children and adults alike.