Power skips (bouncy stilts) are an awesome roving meet and greet act for this theme, adding acts like skating, fire, and contortion add an element of an apocalyptic future. How about Robotic Hip Hop dancers or Break dancers

Amazing costumes, hard hitting choreography, phenomenal tricks.Roller Skaters
‘Pop n Lock’ commercial dancers, Acrobatic Break dancer, bouncy stilt walker
Total Cast = 8  Total Show time =10 minutes

or can be a roving act