"Cyrus "The Colossus" Rhodes is a biotech-enhanced human who works for Prometheus Black. He seems to have issues over being rather small and frail, so he uses the enhancements to transform into a giant that's as big as or bigger than Bulkhead."

Small little dude becomes huge dude. If you want you can do two takes where one is the little voice and one is the big huge voice (voice effects are allowed). I was thinking the huge voice could be a Bane impersonation (any Bane works, but especially Dark Knight Rises Bane).