Here's my interpretation for the mutant octopus Stone in the TMNT 2012 series. He will be part of the next generation in that and in the next generation of Equestria Ninjas. stone is a teenaged mutant octopus who is a student at school that the Ninja Kids go to. But unlike the Hamato Clan and most others, he's a bully who likes picking on others, especially humans. The bullying stems from his dislike of being viewed as weak as well as previous bad experiences with anti-mutnant/alien extremists. Despite his bullying ways, behind it all is a love for his own family, and he hides his mean streak at school with smiles, sweetness and politeness when helping his mother and grandma in their flower shop, showing he has a hidden sweet side when around his family, something that the Ninja Weasels would find out later on and be shocked by.
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