Waluigi would be seen sticking a finger in his nose. (How gross.)

...Wah? Wahahahahaha! Who are you?! He pointed at you.

I'm a Waluigi! And...Yeah! Wah! He said with a proud smile while resting his hands on his hips.

...Whatcha want? He said while taking off his hat to scratch his hair, only just to put it back on.

He's a tall, purple...man. Maybe he's dubious too, Maybe he's up to no good or something like that...He's not a goody two shoes unlike some man in green.