Why I always wondered that? She could have a mini version of her ship as her kart.

 READ BELOW BEFORE POSTING IF You DIDN"T READ THIS THREAD. 

Edit:

Alright let me say this as clear as possible.

You guys said that only mario characters could be in a mario kart game.

So I asked why diddy kong and donkey kong were in the game.

You guys proved donkey kong counts but never proved that diddy kong counts.

Then I asked why samus couldn't be in a mario kart game because she was in smrpg.

You guys said she was a cameo.

I accepted that.

But then I found out that there is also a cameo. R.O.B

Then you guys didn't prove rob to count.

Then there are two other characters that don't relate to mario at all MS. Pacman and Mametchi.

That means there are 4 exceptions to the rule that only mario characters could be in the game.

So that makes the statemen " Only Characters that appear in the mario universe are allowed in mario kart"wrong.

So if you anaylize my response you should see that my logic isn't flawed to believe that there could be exceptions.

Also when did nintendo ever say that only mario characters could be in the game. You just assume since the majority is mario characters that those are the rules.

I think this thread should end because I got my point across even though some people don't see it the way I do.

Because she's not from Mario...it is MARIO kart, not
NINTENDO Kart

well its a mario universe game

samus is not a mushroom kingdom character thats why.

Why is donkey kong in it then? Oh and diddy kong was in dd

Why isnt pichu in mario Kart? 

Arent they both from the same franchise (sort of)

 ouch....this is just bad.

DK was on the first Mario game, that one where u have to save daisy/peach(?) and donkey is throwing barriels. Thats y he is on every Mario Kart game.