Character design, reference sheet, and mark by Rinikka.

Heart and Soul are female earth pony identical twins, who are very close with each other.

They went to medical school together.

Heart

Preferred name: Heart
Favorite thing: Wine-infused dark chocolate
Favorite ice cream flavor: Chocolate

Heart is extraverted, flirty, casual, carefree, sometimes overbearing, and spontaneous. She likes to nudge others outside of their comfort zone, for example dressing her sister Soul up with bows.

She's not afraid to leave her mane as its messy default when she goes out, but will put effort into it if she feels like it.

She likes horror, frights, and scary stuff.

She is a trained medical professional, working in Aeroville as a general practitioner (doctor).

She loves wine and she loves dark chocolate. Her favorite food is wine-infused dark chocolate.

She is protective of her sister Soul, and will stand up to anyone who insults or attacks her.

She is in a relationship with Stormfront.

Soul

Preferred name: Soul
Favorite ice cream flavor: Vanilla

Soul is more introverted and reserved than her sister. She wears her hair in a ponytail.

She is fairly laid-back, careful, and is subtly mischievous, but she still can get worked up over things.

She is a gymnast and contortionist, and so she is physically very flexible. She does yoga often.

She is also a trained psychiatrist and counselor, working in those roles in Aeroville.

She is in a relationship with Andromeda.