Gwen Tennyson by Duncan Rouleau (Man Of Action)
I was fortunate enough to meet Duncan Rouleau at Wizard World in Los Angeles. He was there with the entire Man Of Action Team (the creators of Ben 10), of the creators though I wasn't sure who the actual character designer was (I think it was a combined effort honestly). Looking up online I found that Duncan was the only comic artist of the bunch, the rest being writers as far as I could tell, so I went up and asked him for a sketch of Gwen. I later found out that Duncan was one of the "Concept Character Designers" of Ben 10. Once again I'm still confused about the breakup and credits, and maybe it's better to say that they all created the characters equally.