Equestria Girls Mane-iac Mayhem
From My Little Wiki
The human version of the Mane-iac does not appear as a character in the Equestria Girls media but can be seen on the cover of a video game in Rainbow Rocks. During the special "Movie Magic," Sunset Shimmer is dressed in a Mane-iac costume when the girls end up on the set of movie based on the Power Ponies.
SDCC Mane-iac Mayhem
Mane-iac was the Equestria Girls exclusive for the San Diego Comic Con in 2014.