As the title says, this is Umi (girl) and Sen (TMNT)
from a rather epic fanfiction I've been working on.

At this point, these two haven't even been conceived in the current fan-fic timeline. XD

So this would be them as teenagers.

"Umi" is japanese for ocean, and the girl was inadvertently adopted by Raphael after her father, who was a foot ninja, was killed for failure in a mission.

"Sen" is japanese for 1,000; the name chosen because old folklore says that a tortoise that lives for 1000 years will be able to speak in Human tongue and foresee the future.

There are two other "new-genners" who are also turtles; but none of these guys were conceived by random inexplicable pregnancies or some other such nonsense.

The three new-gen TMNT are all mutations like their care-takers, the original TMNT....

Oh! Yes, of course...Sen was created from a "Black-knob Saw-back turtle." If you go to "turtlesale.com" and look through the pics of baby turtle breeds, you should find that particular type, if you're curious.

His coloration is pretty much taken from his breed,(hence the very yellow skin) except for the black stripes, which would look spectacular, but be very difficult to draw over and over in the future. ^_^;

Now I gotta draw the other two!! w00t!