@TimeMasterXSimilarly with your Hulk application, I don't think there's a need to tie Superman and Hulk to one another if the way you have. If you want to go with the Hulk as a failed attempt to recreate a super soldier I'm fine with that, but his feeding on yellow sun radiation and the Kryptonite thing are a step too far. Similar to your Doom application I would say - don't try to reinvent the wheel.
I might remove the Hulk application all together to be honest. Not that I have a problem changing things just the lure of this version to me was to write him as a failed Superman villain so I don't think I'd find him as interesting to write in this world. I'm still very interested and might do another heroic character once Doom is finished properly, just figured I'd explain before just deleting the post. :)
Hope that's ok?
The possibilities are endless.