Solomon Grundy is such an interesting pick! He has that tragic backstory and the whole "born on a Monday" thing gives him a unique, almost fairy tale-like quality. One underrated villain I think deserves more spotlight is Firefly. He's not just a pyromaniac; in various arcs, he's been portrayed as an almost tragic figure, struggling with his obsession and the lengths he'll go to feel relevant.
On the DC animated front, I always thought his appearance in Batman: The Animated Series had a significant emotional weight to it, showcasing how he's not just a brute but a complex antagonist. It's impressive how these villains can evoke empathy while also being terrifying. What are your thoughts on how animation has portrayed these lesser-known characters? Any favorites?