Captain America. I think I may have only read one of the comics but even I don't remember a lot of it. It has been too long, unless I revisit it. Anyway, after seeing him in the movies, I grew to like him. I'll read more of his comics sometime.
I knew of the character beforehand, but have never read a book in which he was featured when characters like Batman, Superman, and Wonder Woman tend to dominate the marketplace. Until I bought the hardcover collections of Alan Moore's Swamp Thing and James Robinson's Starman. He was an excellent supporting character in both books. I then bought the Andy Kubert-pencileed Man of Two Worlds trade paperback, which was a short, solid read. That very book was solicited for a new release in a deluxe hardcover edition to come out in February, but I'm pretty sure that it's been cancelled, which isn't very surprising given the choices that DC's collections department often makes.
The Doom Patrol,when they came back in the 80s I took a chance. And it became one of my favorite series. Went back and got trades/reprints/whatever of the Silver Age stuff and it was damn good.
Animal Man,his entry in Who's Who felt silly. But grabbed the first issue of his late 80s series and was hooked. One of DC's most powerful and versatile heroes. Plus how the various writers of the solo series delved into stuff like how does a superhero with a family make a living? Or how being a superhero effects their children.