List of turtles

There are more than just 4 turtles in the TMNT-universe. here is a list of all known turtles:

TMNT
Leonardo Michaelangelo Donatello Raphael

Dark clones of the TMNT from the "fast forward" cartoon
Dark leo Dark mike Dark don Dark raph

From the 1987 cartoon
Slash, also from the "archie comics". Tokka, also from the 2nd movie. Kerma, along with an entire alien race of turtleoids.

From the "next mutation" series
Venus