I is a stern, parent-like figure to the lowercase variables in their home. They treat their variables as their students, taking in lowercase variables that have lost their way in life, and despite being strict, they're a very loving parental figure that wants the best for others. They seem to have a desire to appear youthful, despite being over 6000 years old. They tend to replace "me" with "i" when speaking. Adult, they/any.

Q was first presented as very shy and introverted. However, after noticing Soup the Cat, Q became more open-minded. As of now, she's more snarky and irritable, at least when it comes to T, but she's still caring. She's in a romantic relationship with R. Adult. She/they.

R is a relaxed, slow-moving, and quiet variable. On occasion, they appear to have a smug side and get easily annoyed when it comes to T, showing there might be some rivalry between the two. They're generally chill and calm, not wanting to cause conflict or get into trouble. Adult. He/they.

S is an energetic and playful variable. They pertain an excitable and curious personality, seemingly a very happy-go-lucky character. However despite this, they can also be seen easily giving in to peer pressure. Adult. They/them.

T is an egocentric and bold variable. They attempt to take a leadership role amongst R and S, silencing any criticism given to them quickly. They don't appear to be intimidated by the possibility of consequences, often rushing into their decisions and blaming others when things go wrong. They are extremely impulsive. Adult. He/they.

The caretaker and operator of the Transcendent Numbers Pi and Euler. They are the only one who can calm the two down if they get too overwhelmed; but they can be selfish, as they did abandon Euler to go see Objects because they find them "extremely adorable". They are a little irresponsible and egotistical, but try their best. Adult, they/any.

Pi is mean and gets easily annoyed. They don't like when people don't obey them, but they care for other people like when he wanted Thirteen to have a good time at the Object/Algebralien meetup. They aren't afraid to call Square Root out on their selfishness. They're siblings with Euler. Adult, he/they.

Euler is nervous, but more comfortable around those she trusts. While S is trying to find their value, Euler becomes overwhelmed and has a meltdown, which results in I and the variables to try and stop her as the Equation Playground is being destroyed. She says that only Square Root can be the only one that could take care of her, and Square Root left her behind. Adult, she/they.

Thirteen is a very unlucky algebralien, appearing constantly fatigued. They don't like to move around much. They have accepted their bad luck and is trying to live their life to the fullest.