I would suggest finding other IP to work with. Either come up with your own, or go and seek out smaller comic artists who are building up their own IP.
In theory you could try and run a Kickstarter campaign as a 'blank slate' project before you've settled on a world. "We're still on the hunt for the exact story to tell with this, but here is our core game design and what our software can achieve: [neat if slightly generic action stuff, none of which clearly ties into any given IP or character designs]", but I do not suspect you would have much luck getting backers unless you were an already insanely popular dev group. (And if you mentioned DC or Marvel, even to say you were hoping to license their IP for the final product but were open to others, you would already be on terribly thin ice and open to lawsuits.)
Be careful, and pay attention to IP law.