Casey's little sister that was mentioned but never shown for whatevr reason *cough cough* the writers hated humans *cough cough*
Look, I like TMNT 2012 a lot but they had some many plot lines set up that they completely dropped the ball on and never exploring Casey's family was one of them.
We should have gotten to see Casey be a big brother go dammit.
First post of the New Year! Apologies for December kinda being a barren month, but when you work retail, you have zero life in December lol. So now that things are slowing down, I should have more time!