Waluigi is a resident of Vineland Island. He likes to think big and dream even bigger.
Although he is usually seen helping Wario commit crimes against humanity, he is much more docile in his domestic life.
Waluigi claims to practice music as a hobby. The genre of music or instruments used is not mentioned.
Waluigi is the manager of the rankings board, which he puts up in part 1. He states "I'd like to post all sorts of ranking info on this board from now on" so it can be assumed that he updates it daily.
From the moment Waluigi stepped foot into his apartment, he was interested in his neighbor, Sklort McFungus. His first request was to be friends with her. From there, their relationship blossomed, and has become the most steady on the island.
Waluigi is a character from Nintendo, first appearing in the game Mario Tennis in 2000. The only games he truly mattered since then were Mario Party 3 and Dance Dance Revolution: Mario Mix. He has always appeared as a playable character in many spin-off titles, and is yet to get an appearance in a mainstream Super Mario game. He is also one of many most-requested characters for the Super Smash Bros. series, and even Nintendo knows he's lurking in the shadows, waiting for a chance in the spotlight.
As soon as Waluigi came to the island, he was asking questions about Witch. After introducing himself to her, they became quick friends.
During the first rap battle, Waluigi is standing behind Vinesauce, acting as a hype man, though this choice was not based on any existing relationship with him since the two had not yet been formally introduced.
Seeing Witch spit some hot bars at Vinesauce drove Waluigi to ask Witch out on a friendly date (even though she lost the rap battle). The two become close, forming a relationship that seems natural, like the two had known eachother forever.
Deciding to take a up a hobby that benefits the community, Waluigi establishes a Rankings Board, which he continues to manage in the background throughout the series.
At the end of the day, Waluigi and Witch are sitting at the beach, soaking in the dusk sky.