>>545300287
If you really want to do something with the characters you could just try and draw a semi-short comic. Seems to be much more doable then a full blown mod especially if you already have a basic frame work in mind.
Maybe even use that as a testbed for putting your ideas out there.
Making the comic and see what you did right and wrong and even think up of new ideas when you put the ones you have on paper.

That way when you think up of a new character for something else you want to do you can take what worked.