Waluigi

Waluigi is a recurring character found in the Mario series who was made to rival Luigi. Waluigi mainly appeared in spin-off games like Mario Tennis and Mario Party 3. Waluigi is known to be Wario's partner ever since Waluigi made his initial appearance in Mario Tennis for the Nintendo 64. The details of Waluigi's past are unclear since he has no confirmed background, although he has evidently been antagonizing the Mario Bros., especially Luigi. In his debut as seen in the opening of Mario Tennis, where he and Luigi confront each other, it is implied that they have been fighting for quite some time.

Despite the appearance of all three main plumbers in Super Mario 64 DS, Waluigi was nowhere to be found. This was due to them being an extra playable character meant to be unlocked by linking Super Mario 64 DS with the cancelled game Wow! Waluigi using a similarly unreleased application known as the StarPass. Due to this, Waluigi could never be unlocked, without the help of the Personalization A.I. However, several rumors regarding him have been discussed.

Unlocking Waluigi
Several members of the Super Mario community have speculated about a possible way to unlock the lanky plumber in Super Mario 64 DS. However, there isn't a clear way to do so. The most prevalent method to "unlock" Waluigi was Purple Prizes, a magazine which claimed Waluigi was unlockable. The instructions are as follows:

It claims only the best players could find the character. He could be unlocked after gathering all the stars and "being the fastest foot racer in the land". Achieving this, the secret door would unlock. The player would have to race the Rabbit King, who is supposedly the leader of all the rabbits found inside the game. The article also claims that Waluigi's special ability is 'Spring Jump', and that his Power Flower allowed the player to run extremely fast. This was either falsified, or based off of a personalized copy.



Waluigi Remnants
Several people have speculated of several assets in the game hinting towards Waluigi. The most common link is the purple dots on the floor of the Rec Room. Every other colored dot is tied to a character, except for the purple one. This was likely implying Waluigi's presence.

Despite no traces of Waluigi being in Super Mario 64 DS, a purple rabbit can be seen in the US instruction manual for the game. While this could be chalked up to poor printing of the pinkish rabbits belonging to Mario, this rabbit's coloration is distinctly purple hinting that these could've belonged to Waluigi at one point.

Super Mario 64 Manifestation
There have been reports of Waluigi in their personalized copies of Super Mario 64 They have been reported to run around the castle, often in the exact opposite direction of the player. It is believed this is a remnant of Wario Land 64, where Waluigi would have appeared as another playable character. This doesn't make sense however as the concept of Waluigi himself wasn't created until 2000, so takes these claims with a large amount of salt.

Super Mario 64 DS Manifestation
In Super Mario 64 DS, several reports have mentioned unlocking Waluigi, likely due to the Personalization A.I. spawning them in, despite the fact Wow! Waluigi was meant to be the way Waluigi was unlocked. The most common way is finding the Negative World, most commonly by collecting all 150 Power Stars and then grabbing the Power Flowers in the mirror room in an upside-down L formation and entering the white room. In the Negative World, several claim there will be a painting of Waluigi that leads to the Piranha Pit. Beating the Big Piranha Plant in this level would unlock Waluigi, taking the place of the extra door in the character select room. Another supposed way of unlocking Waluigi involves the Black Box, a supposed hole in Princess Peach's Castle that could be accessed with the cannon in the Castle Grounds. This usually contains an extra level of some kind, sometimes reported to be a flooded version of the Castle Grounds similarly to the Sunken Castle found in the original game nicknamed the Submerged Castle, leading to the key to unlock Waluigi. This key is usually a key with an upside-down L, signifying Waluigi, though it can be the unused Big Star Key, a bigger version of the keys dropped by rabbits to unlock minigames in-game, potentially as a placeholder for the model if it can't be loaded for any reason The final method is reportedly finding the Purple Rabbit, which can spawn after collecting all 8 Glowing Rabbits or collecting every rabbit in the game. They can reportedly drop the key to Waluigi or can appear normally as Waluigi's rabbit equivalent. These minigames are usually completely new ones not seen anywhere in the standard game, or even the unused minigames found referenced in the files of the game.

Waluigi himself usually has the moveset described in Purple Prizes, supporting the theory that it was based off of a personalized copy. He has an extremely high jump, and the Power Flower allows him to run incredibly fast in a form called "Warpspeed Waluigi." Alternatively, some have claimed he can throw Bob-ombs similarly to Yoshi's eggs, see secrets around the game that act as more gameplay upon unlocking Waluigi, or somehow use lightning abilities, potentially referencing Luigi's lightning powers in the Mario & Luigi series. The later abilities are much less commonly reported, however.