For this project we built around 15 realistic characters using the studio rig and taking care of each character deformations, including muscles on the necks (courtesy of Tom Ferstl, who developed a tool to make our life easier for that task). The rigs were able to load motion capture through HumanIK.
It’s a pity that the final edit has not all the delivered footage, because Jorge did some insane details on the props for the Rainbows (which are not appearing on the video above).