Feel Free to request and/or add to the list, it was found on tumblr by r-evolve-art!!
A) –Something Written/Drawn–
Each others' names on their wrist/palm/etc
Names on both wrist, one soulmate other enemy, can't tell which one is which
Each other's initials on their wrist/palm/etc
Each others' first words to one another
Each others' last words (to one another)
Same marking on each other's skin
Each soulmate has one half of a quote that is important to their relationship.
A timer for when they shall first meet
A timer for when the other dies
Timer counting up and stops when you'll meet your soulmate
Timer starts counting the moment you meet your soulmate
Writing that says how old your soulmate will be when you meet
Everyone is born with a unique number only they and their soulmates have.
Writing that says what your soulmate is most passionate about
Your soulmate's feelings about you is written on your body
Your soulmates first impression/thoughts about you is written on your body
Written on your palm is what your soulmate is thinking
Each year imprinted on your arm, whispered in a dream, sent in a mail or whatever, is a hint to who/where is your soulmate.
Each day on your arm is a particular event your soulmate will face today. (Examples: Promotion, family death, new pet, meeting soulmate...)
Every night you receive a message about a random sentence your soulmate has said that day.
You have a watch that says the timezone your soulmate is in
The first drawing you see from your soulmate is tattoo-ed on your skin
Meter of how dangerous your soulmate is
Meter of how in danger your soulmate is
A touch from your soulmate will leave an imprint there (like a different coloured area on your skin, or a symbol, or name)
Ink marks (similar to tattoos) are on your body. When your soulmate is in the vicinity, it'll slowly move, as if reaching out. When you two touch, the tattoos will connect with each other.
Counter (maybe on your palm) that depicts how many times you pass your soulmate
Timer of how much time you spent with your soulmate
Timer of how much time you don't spend with your soulmate (maybe only in effect after you meet them)
You only get the first letter of your soulmate's name
The first (or last) words your soulmate speaks every day is written on your arm.
The first sentence you say to your soulmate is written on yourself (after you say it, maybe).
The most important thing your soulmate says to you is written on you.
The most important thing your soulmate says (to you?) that day will be written on you.
