That's a very good question that only Nintendo themselves could answer. It's interesting, since Waluigi Pinball is a retro course in the game, but yet, Waluigi himself isn't.
No. Mario Kart 7 is ONLY for the 3DS. Mario Kart Wii is not the same thing as Mario Kart 7.
mario kart 7 of course
Mario Kart 7 is the seventh installment of Mario Kart games. It is exclusively for the 3DS.
No, he is not in Mario Kart 7
No, but in Mario Kart 7, you can customize it.
Answer: It depends on your copy of the game regionAmerican Mario Kart 7?Australian Mario Kart 7?Chinese Mario Kart 7?European Mario Kart 7?German Mario Kart 7?Japanese Mario Kart 7?Korean Mario Kart 7?United Kingdom Mario Kart 7?Your answer would depend from where your from all game IDs from different countries will be different.
No, Mario Kart 7 is for the Nintendo 3DS
Mario Kart 7
Mario Kart 7 is for the 3DS, not the Wii U. It's Mario Kart 8 that's for the Wii U. And yes, you can get Mario Kart 7 by downloading it from the eShop.
no, only mario kart 7 does
Mario Kart 7 came out recently, so there is no official Mario Kart 9.
A new installment for Mario Kart was announced on the Wii U