Sadly, I don't think you can control what others are going to love about your work. Lee Nordling used to tell me all the time that I did my best work on the projects I didn't care about. That's frustrating beyond belief.
So anyway, a character is what that character does. If you can come up with situations that resonate with readers, then that's what's going to make your work last. If you come up with a series of stories about the same character, and they all resonate to the point where folks start to think of your character as an archtype and say things like, "I want this character to be a 'Hiro-Arturian-esque' creation," then you're on your way to icon status. It hasn't happened to me yet. And in fact, I don't think it has happened to a lot of creators who are nevertheless quite successful.
For example, look at a guy like Brian K. Vaughn. he's successful, and he has created MANY memorable characters, but I don't think he's got any icons yet. Still, that's quite the career he's got with a more than reputable body of work.