Character Evolution

So I've been writing stories and coming up with characters for quite some time. Not all my characters have stuck with me over the years. There are more than a few who I work with once and we end up parting ways shortly after. While I have characters older than the ones pictured here, these guys have kind of stuck with me the longest. They aren't just in one or two sketchbooks, but rather spaced through out a great many. They've followed my artistic development and in a lot of ways pushed me to develop. I was looking through my old sketchbooks during winter break and thought it was neat to see how I've improved since my first few drawings of these guys. 

Just to give you some background: The story of these guys was that Earth had experienced a massive pandemic that wiped out a large percentage of the human population. Scientists found a way to combat the disease by splicing a person's DNA with some kind of animals. Doing this saved the human race, but it was latter discovered that the altering of DNA made it impossible for humans to breed anymore. The characters below are a part of an organization founded by the world government to try and find either a means to reverse the process or a way for the human race to repopulate. The bad guys (the tiger lady and the wolf guy) work for groups that want to stop the government because they believe this to be the next stage in human evolution or mankind's reckoning. The dog guy and fox girl are scientists while the cat girl is their body guard from people like the tiger lady. 

The summary above makes it sound a little better than when I first thought of it in the 8th grade. I was watching a lot of anime at the time so a bunch of the characters and story lines ended up mimicking much of what I was exposed to. Plus I was in that "depressed teen" stage, so some of the characters were really only there to cry and talk about their "dark past".

Maybe one day I'll be able to really sit down and hash out the whole thing into something cohesive. After how long they've been with me, they kind of deserve it.

*edit: all of the ones in color were done in 9th grade, not 8th