You can choose among the nine designs they made for 'Call' and the top three will be chosen via popluar. You can vote now via their main Kickstarter Page and anyone can vote between now and October 1st.
via N4G: pc news feed http://n4g.com/news/1364289/vote-for-mighty-no-9s-new-co-op-character
via N4G: pc news feed http://n4g.com/news/1364289/vote-for-mighty-no-9s-new-co-op-character