(EDITED)
These soulmate marks were inspired by other stories and stuff I looked up. ಥ_ಥ My brain is fried from research FML. -_-b
In every universe, everyone has a soulmate. People usually only have one soulmate, sometimes two. Once someone turns 18 they can feel the pull of their soulmate mark. There are only a few commonly known ways to find your soulmate, but there are many ways that most won't know about especially from our world the normal non-magical world
(IDK the right way to put it...  ̄Д ̄=3 )
Here are the ones that are common in y/n regular world.
The most common way is the Soulmate mark or Soulmark- which is a mark or an easier way to put it would be a birthmark of some sort. Most people are born with their soulmate mark each mark is unique in its way some small, others big... hell there are even some that are just a line. Sometimes, it can even be your soulmate's name though, that is a little rarer. When a person meets their soulmate, both parties' soulmate marks will glow silver or gold, then become a midnight black color like a tattoo. (their marks are originally gray.) (P.s Everyone has a soulmate mark. Just a few others get special abilities with theirs.)
Soulbond - which happens when they make eye contact with each other for the first time. They will instantly feel a strong attraction and connection toward each other.
Soul-color - Both parties or only one out of the soulmates will have this, they will be colored blind and only see black and white until they see their soulmate. No, they do not have to make eye contact they just have to see their soulmate's face.
Gilthunder
Finally, the last common one is the Red Strings of Fate - just as the name implies, on each person's pinky is a Red thread or string, and as they get closer to their soulmate the string gets smaller until they are face to face then it disappears.
Elizabeth
Now we are getting to the more uncommon ones that are for the other worlds or universes (Idk what to call it anymore ◔_◔ ) keep in mind that most of these don't happen till both soulmates are 18 or older SOMETIMES they can be 17 and the soulmate marks will start to affect them already but most of the time they will only have the mark and fee the pull after they are of age.
Soul-art - If a person draws or writes something on their skin, the same thing will appear on that person's soulmate in the same spot.
Merlin
SoulSong - If a person sings their soulmate can hear their song, it is like a concert but only they can hear it. As if the soulmate is right beside them.
Ban
Estarossa
SoulTime - On a person's 18th birthday a set of numbers will appear on both parties as a countdown to the moment both will meet each other. (Think of that Justin Timberlake movie... In Time (Totally didn't have to look up the name (-_-;) anyway instead of it being a countdown to your death it's a countdown till you meet your soulmate. It will also appear on their wrist too unless they are not 18. Then the other person has to wait.)
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Other World Soulmates Yandere various Seven Deadly Sins x Reader
FanfictionI adopted this book from @xXYandereWriterXx. It is sad that YandereWriter decided to stop writing, Their stories were a few of my favorites to read. I hope I don't disappoint with this story I will try my best. The description: Soulmates were known...