Clinton "Clint" Francis Barton- agent of SHIELD turned super-hero turned criminal after the Sokovian Accords.
Bernard "Barney" Charles Barton- FBI agent turned criminal turned spy- under the false name of William Brandt.
Like the oldest story of the world- two brothers, always fighting each other. Ready to pull the trigger on their own twin.

(AKA: X-OVER, WE ARE THOU?)