The Bat Family includes many characters who rank among DC's greatest martial artists. Batman himself has always been a top contender, Nightwing and Red Hood have both defeated their father on more than one occasion and Damian Wayne's Robin was born to fight as the son of Batman and Talia al Ghul. Azrael, Batwoman, and Huntress have also all taken on and been trained by the best of the best. While all great fighters in their own respects, it's no secret to DC fans that the second Batgirl, Cassandra Cain-Wayne, stands above the rest of the flock.
Source：https://www.cbr.com/spirit-world-cassandra-cain-bat-family-best-dc-fighter/
