Okay so I’m seeing some people arguing about what Turbo’s canon appearance is. Is he chubby? Does he have sharp teeth (or sharp canines)? Is he short? Are his shoes hi-tops? Does he have a second T on the back of the helmet? What is Turbo’s canon design?
The answer is nothing.
Let me explain.
The designs between 2D Turbo (when he’s an 8-bit sprite) and 3D Turbo are completely inconsistent. Observe:

Here’s one of the frames of the infamous “camera mugging” shot, where he’s in blocky pixel-3D. Notice how he has red stripes on his sleeves, like on his 2D sprite:

Now here’s the same shot literally one frame later, where he’s in full 3D:

No red stripes on the sleeve. They just vanished??

No sleeve stripes here either. Where’d they go, man?
So for whatever reason, 2D Turbo’s design is different from 3D Turbo’s. Maybe the animators just fucked up, I dunno, but still, there’s no way to know what the intended official design was. PERSONALLY I think 2D Turbo is closer to how he was supposed to look, since that was the design that was also used in the supplementary material (picture books and such), but the right answer is really just… that there is no right answer.
THEREFORE, DRAW TURBO HOWEVER THE FUCK YOU WANT :D With so much inconsistency going on it’s better not to worry about “canon” and go with whatever your own aesthetic preference is, and importantly, NOT get on someone else’s case about how they like to draw Turbo.
For example, I like Turbo with sleeve stripes, converse-like shoes, a little chubby, the same height as the Twins, dull front teeth but sharp canines, no T on the back of the helmet and scruffy black helmet hair and pointy ears under his helmet. In my PERSONAL OPINION I think the T on the back of the helmet looks… really dumb but if someone else likes it? Whatever gases your kart, bro. Same goes for hair headcanons (haircanons?); I don’t like the mohawk, but it’s fine if you do.
So let’s not fight about this anymore and just draw more Turbo UvU