Sachiko Takada(高田紗千子) is a Japanese comedienne. She has formed a comedy duo,"Umekobachi(梅小鉢)", with Mayu Komori(小森麻由) since 2000. Takada and Komori were classmates in high school.
Takada is known for her impersonations of Japanese celebrities such as Miho Kanno(菅野美穂), Megumi Yasu(安めぐみ), Shizuyo Yamazaki(山崎静代), Serina(芹那), Shoko Nakagawa(中川翔子), Suzanne(スザンヌ) and Kaori Mochida(持田香織) and so on.
Here is a video of Takada doing impersonations of Miho Kanno and Megumi Yasu by turns.
Here is a video of Takada doing impersonations of Miho Kanno, Shizuyo Yamazaki, Serina, Megumi Yasu, Shoko Nakagawa, Suzanne and Kaori Mochida.
Sachiko Takada's blog