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Tomoko Sasaki is a Japanese musician and voice actress who voices the Chao in Sonic Adventure and Sonic Adventure 2. Her clips have been recycled in Sonic Shuffle, Sonic Advance, Sonic Advance 3 and Sega Superstars.
During Sonic X's production period (2003-2005), the role was recast to Ryo Hirohashi, who also played the character in the main series games released during that time (Sonic Heroes and Shadow the Hedgehog).
Sega has since returned to using Sasaki's clips, as evidenced by the DS versions of both Mario & Sonic at the Olympic Winter Games and Sonic Colors and the Wii version of Mario & Sonic at the London 2012 Olympic Games.
Tomoko Sasaki's profile on behindthevoiceactors.com