* Artistic License: Cartoon characters often have exaggerated or unrealistic features for visual appeal. Mario's brown hair and black mustache might just be a stylistic choice to make him more recognizable.
* Italian Stereotype: Mario is a classic Italian character, and the stereotype of dark hair and mustaches might have influenced his design.
* The Magic of Mushroom Kingdom: It's a magical world, and maybe hair color is just a bit more fluid there!
In the end, it's just a funny little inconsistency that adds to Mario's charm. We love him for it! 😊