Your Charisma score increases by 1 and two different ability scores of your choice increases by 1.

A gemine can usually present its other form since birth, in some cases the other form does not manifests till the later stages in their life.

Some are born in an incomplete state, they are unable to feel emotions and have parts of their body missing. To fix this issue, its necessary that another being is merged with the gemine. In that case both of the original bodies will be rebirth as separate bodies.

Before they reach adulthood, a gemine develops features that marks it as a divided being.

That feature shows itself in different ways : being blind in one eye, unable to see colors, half of their hair is either missing or colorless, a shadow with holes, being unable to talk or having a voice that sounds like its coming from afar

Gemine Clothes

Each of the forms clothing is merged into their body when they merge, its not possible for a gemine to change clothing while merged.

Gemine can live up to two centuries, but, their lifespan can be cut shorter if one of them is killed while separated.

Your base speed is 30 in either of your forms.

You can speak, read, and write Common and two other language.

You have proficiency with two of the following skills: Perception, Investigation, Deception and Performance.

As an action or bonus action, you can transform into your other self as if you were casting alter self (no concentration is required and you can only change your appearance to transform into your one of your forms using this trait).

When you change to your other self, your actual form clothing merges with your body, and your other self clothing appears, other objects like weapons, armors or backpacks are not affected. If you have objects in your clothes pockets when you change, those objects move to your other self pockets, or fall to the ground.

Once per short rest, when you are charmed, put to sleep or mind controlled, you can make a Wisdom saving throw to use your Shift feature, turning into your other form.

While both form have the same alignment, they have distinct personalities and ideals, bonds and flaws.

You can also ask yourself, how different is your other half from you ?

When creating a gemine you can choose one of the quirks listed bellow.

Gemine Quirks

Eyes : each of your forms as a different eye color.

Hair : your hair is two colors, one side fading to the color of your other form hair.

Shadow : you cast two shadows, one for each of your forms.

Voice : you speak with two voices when you speak.

Reflection : when you face a mirror or any kind of reflective object, your reflection is your other form.