Not every turtle is cut out for the ancient martial art of ninjutsu. It's a sad, but true fact. Ninja turtles must have a certain set of skills, and no amount of toxic ooze or hanging out with a rat is going to make these reptiles ninja warriors.
1. Coordination skills are key.
2. They should be able to escape any situation.
3. Bravery is a must.
4. Again, coordination skills.
5. If partying then yes, but if simply stuck -- no.
6. A general ability to eat food is necessary -- for being a ninja and life.