User blog comment:CupcakeDancerTheSecond/Theory: Is Serena Not Actually Human?/@comment-34709901-20180222230946/@comment-4990633-20180222232917

I see well that is Shinobu who help Serena escape from the rival ninja village and team rocket which she used a ninja trick to escape they later reunite with Ash Clamont & Bonnie so yeah still the same human.