Trans Marco Theory

Trans Marco Theory

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Trans Marco Theory is a fan theory that states that Marco Diaz, the male main character of the cartoon series Star vs. the Forces of Evil, is actually a transgender girl. The theory has led to derivative fan following, inspiring fanart and a subfandom about it.


The origin of the theory is often considered to be tenth episode of the series' first season, "St. Olga's Reform School for Wayward Princesses", which first aired on August 10th, 2015.[6] In the episode, the characters Star Butterfly and Marco Diaz try to break into a prison in order to rescue one of her friends. However, in order to sneak in Star gives Marco a princess disguise (shown below).

After the episode, fans began to theorize that Marco Diaz was a transgender girl based in the actions of the episode. On July 22, 2016, Tumblr user Breastforce created a master post of covered evidence of dysphoria and a desire to be female by Marco, which gained over 10,000 notes in a year.[1]


On September 29th, 2016, the Tumblr blog marcodiazisatransgirl was created to document evidence and share posts about the trans Marco theory.[4] About five months later, on February 17th, 2017, Jenniferdiazisatransgirl, a blog for similar purposes with the addition of discussing the ship between Marco and Tom Lucitor, made its first post.[5]

Rougly two weeks later, on March 1st, Breastforce posted an updated version of her original, which covered newer evidence as well as comments from the people who worked on the show. It gathered over 3,000 notes in 4 months.[2] The theory has gained a large following within the fandom.[3]

Various Examples

I WANT TO BELIEVE I'M TRANS also emale female NarcoMarco
Butch Femme High Femme Butchy Soft Femme Butch Stone Butch Futch 5 1/2 2 3 4 7 8 9 5 6 10 to

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