Mr. Computer Image (1968)
First talking CGI character, first full body motion capture
Video (full version)
1) Made by "Animac". This animated guy had a face made of the ABC logo at the time, and was pitched to the network execs to present the election returns. (They didn't buy it.)
2) For more motion capture watch The Stick Man (1967).
3) First talking polygonal CGI character was in Faces and Body Parts (1974).