Funny you should say that, this is an old design but when I was rethinking the game lately and designing new characters themed karts came to mind.  That one specifically :p I definitely want to incorporate that now.

would be cool if the go-kart were related to the scuba diver. Looked like a submarine, same brassy look as helmet, shark face on front, etc.

 scuba diver because of the pun of scuba driver, originally thought up for a game I wanted to do.

Thanks for the constructive criticism it's taken into account :P

I love this little guy!! Some detail on the front on on the kart like a number or lights may add some more character and help it read more like go kart.

why a scuba diver in a go-kart? :B

Good!! Nice character!