1. According to color theory, purple is the complimentary match to Wario's yellow, just like Luigi's green is the compliment to Mario

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Graphic Design by Guillermo Javier

 

2. He's the only character in the Mario franchise to acknowledge their genitals

 

3. He has no official "origin" according to Nintendo lore...

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Art by BabyVegeta

 

4. His voice actor Charles Martinet says he might not even be Wario's brother

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Art by Sklavenbrause

 

5. Martinet also said that his key personality trait is "self pity"

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Art by patchesdraws.tumblr.com