Bowuigi

Bowuigi is the slash ship between Bowser and Luigi from the Super Mario fandom.

Canon
Luigi and Bowser have known each other since childhood, as shown with Mario and Luigi: Partners in Time and Yoshi's Island. Within the latter, Baby Bowser forced Kamek to kidnap the Mario brothers, with only Mario managing to escape and Luigi being taken away. He was later rescued and reunited with his brother.

In terms of interactions in the present day, Luigi has fought the Koopa before, but prefers to stick to the side lines. Certain games such as Super Mario Galaxy and New Super Mario Bros U feature modes in which Luigi defeats Bowser by himself without Mario's presence. However, these are typically considered 'hard modes' and non-canon. In terms of thoughts on each other, Fortune Street reveals that Luigi doesn't trust Bowser and suspects that he always has a princess locked away in his castle. The Mario and Luigi sub series has Bowser constantly forget Luigi's name and refer to his as 'Green 'stache.' However, in recent titles, he appears to remember it more.

Like his brother, Luigi has also cooperated with Bowser as well. Both of them are playable characters in Super Paper Mario working together. They also have a history of playing sports and party games with each other. In Bowser's Inside Story, both him and Mario agree to help Bowser in order to defeat Fawful. However, Bowser becomes enraged once he learns of the brothers' assistance. After a fight that leaves Bowser heavily-injured, he is given a cake adorned with Mario, Luigi, Peach, and Bowser himself.

In Super Mario Adventures, the Koopa Kids blackmail Luigi with Mario's life in order to achieve Princess Peach. Instead of returning her, Luigi disguises himself as Peach in order to save Mario. When Bowser contacts them, Luigi pretends to be infatuated with the koopa, going so far as to saying 'I love you' and agreeing to a marriage between the pair. Bowser becomes excited and, after seeing the disguised Luigi with a cough mask, even shows concern for him. However, on Bowser's end, he believes Luigi to be Peach.

Fanon
The ship suddenly grew in popularity due to fan artists' comics in which Luigi and Bowser slowly forming a romantic relationship. Comics typically were based off of either Super Mario Adventures or the main series. Either way, due to forbidden love and enemies to lovers being tropes in the relationship, it began to rise in popularity.

Fandom
FANFICTION

TUMBLR