Creativitwins

Creativitwins is the family ship between Roman Sanders and Remus Sanders in the Sanders Sides fandom.

Canon
"Dealing with INTRUSIVE THOUGHTS" starts with Thomas saying that he slept poorly that night, Logan and Patton are already aware as to why while Roman is completely oblivious. It is already established that whatever kept Thomas up that night, Roman should not be allowed to hear it.

Remus' first line in his debut episode has him whisper "Have you ever imagined killing your brother?" to Thomas, only to slowly sneak up on Roman behind the TV, look at him weirdly and then pull out a spiked mace and bonk him over his head to "kill" him.

Remus then quickly takes Roman's place for most of the episode, introducing himself as "The Duke" and Logan explains that he's Roman's twin brother. Thomas is utterly confused, he had no idea that Roman had a brother. Logan then explains that Remus was the byproduct of Thomas valuing the good side of his creativity, which led to his "darker" creativity taking on a mind of its own and manifesting itself as intrusive thoughts. So Roman and Remus are the first Sides to be directly related to one another, they used to be the same Side before until "The Split".

Remus is jealous that Roman gets all the attention from Thomas and responds to it by being as violent and intrusive as possible. The conflict of the episode revolves around the Sides trying to get rid of Remus, and Logan has to tell Thomas that it's okay to have intrusive thoughts and that he shouldn't think poorly of himself just because his own mind occasionally freaks him out.

Roman regains consciousness and just after Remus decides to leave Thomas be for now, Roman spits about how much he hates his brother. When Thomas asks why Roman never told him about Remus, Roman simply says that he doesn't like talking about him.

Fanon
Remus quickly became a very popular character and, just like Deceit/Janus before him, was shipped with all of the main Sides in a matter of hours. The ship is far more popular platonically, on AO3, it's the sixth most popular ship for Roman and the third most popular ship for Remus (only being beaten by Dukeceit and Intrulogical).

Though there is very little Remus content, only appearing in one canon episode, the ship has tons of content to work with, often dealing with "The Split". Canon doesn't really elaborate on how Roman and Remus were actually split into two. Fans often theorize that Patton was responsible, somehow having the single Creativity Side split into encouraged Creativity (Roman) and "Forbidden Creativity" (Remus). The single Creativity is often given the name "King Romulus" in fanwork, after the fabled founder of Rome. Should the Sides be portrayed as seperate humans, Roman and Remus are often the sons of a man named Romulus. Whether Romulus is related to Thomas tends to differ.

Audience interpretations often characterize Remus as deeply unhappy, believing that things were "better" when he and Roman were the same Side. He's sometimes right to think so, other times he's portrayed as villainous and trying to force Roman to fuse back together. Regardless, many fanfics often depict Roman and Remus as slowly getting along, either by having Remus become calmer and more considerate or Roman become a Dark Side.

Many also theorize that Remus is only as strong as the Sides make him out to be: Roman immediately goes down in one hit while Logan can shrug off Remus punching his front teeth out and getting a shuriken stuck in his forehead. Many have interpreted this as Logan being able to nullify any attack from the Dark Sides with pure logic, while Roman is still utterly terrified of Remus, despite his high-and-mighty attitude. This is helped by "Putting Others First" confirming that being compared to Remus is Roman's biggest weakness and Janus merely suggesting that they're anything alike leaves Roman in a catatonic state.

To get this out of the way, yes, there are some fans who ship Roman and Remus romantically, but the ship is extremely controversial in the community and unpopular to boot, not even cracking 400 fanfics as of this writing. Though all of the Sides are technically the same person, fans insist that Roman and Remus are genuinely related by blood, given that they came from the same Side one way or the other. Though in the rare fics for the pairing, Remus is often the instigator, since things that freak other people out are his speciality, while Roman wants none of it (at least initially).

Fandom
TUMBLR

Trivia

 * Remus is named after the twin brother of Romulus. According to legend; Romulus killed Remus to found Rome by himself (much like how Remus tried to kill Roman to take his place). The name "Remus" literally means "twin".
 * Remus' sigil is a sword with tentacles, printed on the back of his jacket, contrasting Roman's sigil of a shield depicting a fancy castle, printed on his sleeves
 * In one of the outtakes, Thomas calls Remus an "evil Luigi", since Roman and Remus have a similar color scheme to the Mario Brothers.