If I was in charge and there
had to be a female turtle, I would have made it so Shredder or someone mutated a person into a mutant turtle and then throughout the series have the TMNT trying to reverse it...(And probably succeeding at the end of the series)
I agree, April and Casey were needed. I also say Shred shoulda been the villain
not some dragons, a monkey and vampires

Venus's magic was
useless!!! She never did anything with it...Then in the episode they tried to justify her (Last ep) they failed miserably cause it was a clip-show