he is 10 or 27
I'd totally pick 27.
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waluigi wario is his last name
no rosalina does not like waluigi she likes luma and polari!
Wario and Waluigi are brothers. They're the evil opposites of Mario and Luigi.
Luigi is Mario's brother. Waluigi is Wario's brother. They might all be brothers, though.
I don't think that any of the girl characters are in love with Waluigi, but who knows?