Nintendo Explains Absence of Non-Mario Characters in Mario Kart World

TL;DR
The producer of Mario Kart World explains that no crossover characters from other Nintendo franchises are included because it was deemed unnecessary and incongruous with the Mario-centric universe. The game focuses solely on Mario characters, with new racers like the Cow gaining popularity, and maintains the core fun of the series despite some criticisms of its open world design.
- Mario Kart World producer: ‘It didn’t seem necessary’ to add characters from other Nintendo games Video Games Chronicle
- Don't Expect Zelda, Animal Crossing or Other Nintendo Franchises to Pop Up in Mario Kart World, Producer Suggests — 'It Would Have Seemed Incongruous' IGN
- Why isn't Mario Kart World a crossover racer? A Nintendo dev says it would have been "incongruous" Eurogamer
- Nintendo on why non-Mario characters weren’t included in Mario Kart World My Nintendo News
- "It Didn’t Seem Necessary": Nintendo Has A Brutally Honest Response For Mario Kart World Players Wishing For Guest Characters TheGamer
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