April Derp is a malformed clone of April O'Neil. She exhibits super strength, but an incredibly low intelligence. She has a vocabulary that consists almost solely of the word "derp".
April Derp is an obvious prototype or imperfection compared to the dozens of other April Clones that the Kraang had developed and thus is put in the "reject bin" by them. Still, due to her magnificent strength, she is played as a trump card against the Turtles during their invasion of TCRI.
April Derp is killed by a psychic pulse from the real April.
- The term "derp" has been in use since at least 2009, and is an expression associated with clumsiness, carelessness, ignorance, and stupidity.