Each character is excellent, without a doubt, but for punishing villains, only one of them can be the best.
Since Batman isn’t a playable character, nor are other Bat Family members like Jean-Paul Valley or Cassandra Cain, it falls to one of these characters.
Robin (Tim Drake) is hands-down the best character in Gotham Knights
Red Hood, for example, is awesome in ranged combat but is also a solid melee fighter.
Nightwing is great in co-op and is for players who love awesome combos. Batgirl, on the other hand, is an outstanding all-rounder.
He’s likely the one that spent the most time with Batman at this point, but that doesn’t mean much when it comes to actual gameplay mechanics.
Best skills– Turnabout Takedown– Vantage Hanging Takedown– Slideways TakedownBest momentum abilities– Bo Spin– Cloak