Wario

Wario is one of the main characters within the Super Wario Bros.: Daily Life At Smash series, and is the main protagonist, alongside Waluigi.

Original Story
Wario is much like his original character in the Super Mario and Wario games: he is greedy, gluttonous, lacks respect for most people that aren't him or Waluigi, and likes potty humor. However, he does contain a few differences from his original counterpart, most notably that he lacks more common sense and that he enjoys meme humor.

Reboot
Wario has a similar personality in the reboot, though it does contain some differences, such as enjoying frequent exercising and a surprisingly high intelligence when it comes to electronics.

Relationships
Waluigi is Wario's closest friend and is his brother (though the original story never outright states the latter, nor does actual canon). The two very rarely argue, and treat each other with respect, which is rare for either of them to really respect anyone else.
 * Waluigi

Prior to unleashing Weegee from The Internet, Wario found him to be nothing more than just a funny meme. However, once Weegee was freed and started attacking the Smash Grounds, he grew to despise the meme to a degree. Weegee and Wario both treat each other as arch nemeses.
 * Weegee

Falco is Wario's closest friend aside from Waluigi, though the two do argue frequently. However, these arguments are short-lived and usually aren't hectic.
 * Falco

Trivia

 * Despite the fact that Wario's primary outfit in the Smash Bros. series is his biker outfit that originates from the WarioWare series, in Daily Life At Smash he's only described as wearing his original plumber outfit.