Suggested by Sonic Captain Boomerang is a very resilient Flash villain who always gets up for another round. It’s always been a little interesting how most of Flash’s enemies are at a level where they could never hope to challenge him, but it still makes for an interesting dynamic. Nevertheless, Mirror Master easily wins this round. His mirrors blast away at enemies with incredible speed and he is also a very agile fighter. Boomerang’s had a lot of tech upgrades over the years but nothing that can help him compete with such a villain. Mirror Master wins.