Board Thread:Questions and Answers/@comment-25877223-20141220080041/@comment-995426-20141221111104

"Imagine having sex with a turtle (Creepy. You should read some of the fanfiction they made. And having a child half human half turtle, OMG)" Oh, that's been done before in fiction, many times. There are all sorts of ways to design and write about interspecies children in fiction. So, if April and Donatello did have an interspecies child together, that child could conceivably look like anything between an ordinary human and another mutant turtle.
 * Sliding Scale of Anthropomorphism (All The Tropes wiki)
 * Grassrunner Clan (Breath of Fire series)
 * Teenage Mutant Ninja Turtles & Other Strangeness had a very nice section and illustration here that deconstructed the concepts of mutant appearance in a sliding scale between unaltered animal and complete human appearance. In particular:
 * Looks: None &mdash; like Splinter, the turtles and Leatherhead
 * Looks: Partial &mdash; maybe like the 2014 movie turtles
 * Looks: Full &mdash; like Marvel's Wolverine

Another possibility is some admixture of Kraang traits, since April has been engineered over the generations of her mother's family to be a perfect half-Kraang mutant herself, albeit with a completely human appearance. But even if she somehow got together with Casey Jones and had children with him or some other human male, what's to say her children couldn't have unpredictable mutations themselves, simply because of April being their mother?

Anyway, I digress back to the topic. It would be really nice if Gabrielle could be introduced as a love interest to Casey. If they're both old enough (2k12 Casey is already 18 years old), they could even conceivably be married on the show, just like they were in the Mirage comics. Though, kid-friendly Nickelodeon might not allow Gabrielle to get pregnant with Shadow until after she and her new husband are wed, with only the most audience-age-appropriate explanation of the birds and the bees&mdash;this would also probably make Casey Shadow's biological father, which he wasn't in the comics (Gabe was already pregnant when they met).