(Personal Opinion)
I'm a BIG FAN of the animation in this series. It's incredible and I do enjoy the use of lesser Batman villains that often don't get remembered being used as well!
As for characters, I think they were executed well. The penguin being a woman was a bit of a shock but, in my case it seems, it was a good shock. I don't know why but I really enjoyed The Penguin being a woman. (Not to say I don't love the male penguin also.)
Not to mention I think Harleen Quinzel being a (mostly) singular operated was really cool. I do hope we get to see the Joker soon! Keep up the great work!