Sake (pronounced Sha-kay) was a removed character that was originally supposed to make his appearance as the middle boss in Tekken 3.
Within the arcade version, there are still remnants of the character left over and when hacked to be played as, he uses Yoshimitsu's body and Jin Kazama's moves. Katsuhiro Harada revealed the following in a forum post on August 1st, 2010:
"Regarding 'SAKE', this was included when we planned to implement a new animal character. But there were a few problems..."
"It was really a salmon so, no matter if you press punch or kick, the character just flops around making a flapping noise... At the time, one play was 100 yen (a little over a dollar) so that is the quality bar to keep in mind for customer satisfaction. So we thought players would get quite angry if they had to pay that much to play such a character, and we gave up on that character. That kind of character might be OK in a console version, but not for the arcade."