Waluigi is Luigi's cousin and there rivals with each other that's how they know each other.
There is no official answer, honestly. All we know is they are Mario and Luigi's "evil counterparts." well Mario and luigi are cousins and waluigi and luigi are brothers Mario and Luigi are brothers... and I highly doubt that Wario and Waluigi are cousins with Mario and Luigi.
Not that I know of.
Indeed they are enemies. Waluigi is to Luigi as Wario is to Mario - bitter rivals. Heck, Waluigi's hat has a backwards L.
Yes. Waluigi might be tall, but Luigi has been around longer and will always win the fight against Waluigi.
Luigi's mother had 3 kids luigi mario and waluigi luigi and waluigi were twins and shared a room and mario had his own room luigi started crying so his mother came and got him and waluigi and put them in the car they got taken to the hall for a baby show but waluigi got zapped by a light that turned him evil so luigi won the bay show
No
Luigi is the best after Waluigi so pick him a lot unless you have Waluigi.
Luigi is Mario's brother. Waluigi is Wario's brother. They might all be brothers, though.
they are brothers but they are half-brother luigi is Mario brother and waluigi is wario kind of brother but i don't know for sure but some people think that luigi and waluigi are brothers but again i still don't know for sure but i do know this Mario,luigi,wario,andwaluigi are all related.
They don't have one. Like Mario and Luigi don't have one. I don't know what Wario and Waluigi's last names are, but I know that Mario and Luigi have last names: Mario Mario and Luigi Mario. That's why they're called Super Mario Brothers.
Waluigi's symbol is a flipped L because he is a flipped Luigi whos symbol is an L. For example: Luigi is good, Waluigi is bad (most of the time) Luigi is tall and has a little moustace and Waluigi is REALLY tall and has a REALLY short moustace.
Daisy. Waluigi supposedly likes Daisy but Daisy prefers Luigi. Smart girl!