My favorite is Colossus. On a basic level, he's a man made of metal, which is innately awesome, but he's a good guy who's very empathetic. He's an artist, but he's not afraid to pound a guy in the face until he stops moving. It's a shame he never really gets the face time of Cyclops or Wolverine (who get entirely too much face time).
My other Marvel favorites are Spiderman, She-Hulk, Captain America, Jamie Madrox, Spiderwoman, Luke Cage, and Molly Hayes. Outside of Marvel, I like the Question, Green Arrow, Barbara Gordon, Death, and Bigby Wolf. (the last couple aren't traditional caped fighters, but interdimensional adventurers should get a nod)
My other Marvel favorites are Spiderman, She-Hulk, Captain America, Jamie Madrox, Spiderwoman, Luke Cage, and Molly Hayes. Outside of Marvel, I like the Question, Green Arrow, Barbara Gordon, Death, and Bigby Wolf. (the last couple aren't traditional caped fighters, but interdimensional adventurers should get a nod)