Ura

Age: around 28
Gender: male
Physical description: slightly above average height but often slouches, black hair, grayish skin, generally looks worn out, both hands prosthetics - the newer one (installed during the story) is more slim and modern looking, the older one is bulkier
Personality: ISFJ, is fond of people but avoid direct contact, has a good heart but is a bit slow

Ura lived a peaceful life of a maintenance worker, or at least as peaceful as you can in a postapocalyptic word where humans almost died out, until the day the sentry tower he was currently assigned to was attacked. He's friends with Riz and has feelings for her, but he's too shy to do anything about it.

Riz

Age: around 25
Gender: she/her agender
Physical Description: androgynous looking, messy ginger hair, most of body replaced by prosthetics
Personality: ESTP, cheerfull, supportive, curious, excited about technology

Riz spends days digging through the old archives trying to find anything useful, and loves to share her findings with the overseer Sylvia and Ura. She enjoys Ura's company but she's completely oblivious to his feelings for her because she has Sylvia.

Sylvia

Age: do not ask
Gender: female
Physical description: tall, dark hair, keeps all of her body except the head/neck covered
Personality: ISTJ, strict, cares about the colony's survival more than anything else

Sylvia overseers the colony while also being the head of the medical staff. The colony as a whole means everything to her, which in turn means that she might come off as cold to the individuals there. She's by far the friendliest with Riz.