When I started watching Harley Quinn I was like "They didn't get Mark Hamill for the Joker?? This is a travesty!" But he does do a very good job with the role, and Clayface is just fun.
I love the show and it's cool to see a relationship between two people of the same gender be portrayed as loving and a real partnership. I hope they never decide to do a breakup episode, even if they get back together by the end. I don't think Harley and Ivy should ever stop loving each other.
2019 was the start and I've happily watched all four seasons. A fifth season is on the way.
I don't know, but when I first caught it I loved it and have spread the word amongst my peers. I am older, so maybe I am out of touch with what the young folks are watching (my nephews have seen it). Alan Tudyk plays both Joker and Clayface. Joker is in it quite a bit, but they fade him out for a few reasons. Then he comes back.
They also use so many other celebrity voices. You'll think, "Hey, I know that voice!" Indeed you do. Ron Funches and Tony Hale are wonderful in their roles.
So keep watching and you'll see a lot more of him. That is, if you like the show. I think it's excellent and well worth the time.