Probecule's biggest nerd. Programming, engineering, gaming, optimizing over spaces. Loves data, loves infodumping, will sometimes struggle with NOT infodumping if that's what's called for.

Mourner
She's grieving something, someone. She's a bit younger, sadder, shyer - not as sure of herself as the others. Who/what she lost was important to her and central to her understanding of herself, initially unhealthily so.
Once she comes out of her shell a bit, she's easy to make laugh and tries to do what she can to fill gaps, often a bit too hard.

dreamer~
shitposting, perhaps-unfounded optimism, "creative" "problem" "solving", trying to keep an eye on the big picture (not always very good at it). Surprisingly easy to fluster for how flirty she is.

Guardian / protector / polycule mom. Considers herself responsible for keeping Her People safe and happy and fulfilled. Mature instances of the template consider themselves to be one of their people, but they need to learn this.

Probcule leader. Explorer, diplomat, social butterfly. Insatiably curious - bonds with the other probecule members over their special interests. The most extroverted of the bunch, but in a way that typically prioritizes meeting new people and learning things about them over forging lasting relationships with them - she has to put active effort into maintaining the relationships she's chosen to invest in.