Superman is my favorite superhero, possibly my favorite fictional character. But when it comes down to it, my favorite moments in Superman stories rarely involve Superman directly, but instead are about the men, women, and children inspired by Superman to be brave and do the right thing, even at great personal cost. The little boy standing up to his abusive father in Action Comics #0. The population of Earth rising up to face Mageddon the Anti-Sun in JLA #41.
Which is why I love Bizarro so, so much. There are a few characters explicitly inspired to heroics by Superman (Supergirl, Superboy, Steel), but Bizarro is the only one who, by narrative conceit, can never live up to the ideal. Whatever his origin (and there’s been a few), Bizarro’s defining characteristic is that he’s “the imperfect clone of Superman.” He wants to be the hero but he always gets it wrong, often so badly he does the exact opposite of what Superman would do. He even speaks in opposites, replacing “hello” with “goodbye” and “hate” with “love.” This makes Bizarro an extremely versatile character.