Connection Boo Was Played By A Real 2-Year-Old Boo was played by Mary Gibbs, who was only two years old at the time of voicing her character counterpart for Monster's Inc. Daughter of one of Pixar ...

The post’s author shared that “Boo’s real name is Mary, the same as the young girl, Mary Gibbs, who voices Boo.” They added, “This is only just visible on one of the drawings Boo makes ...