I have a au for the algebraliens, its like sort of inspired by Steven Universe lore. The algebraliens in this au have existed for like, MILLIONS of years. I really enjoy how the concept of evolution works so I of course thought it'd be fun to add how they evolutionized. Might I mentioned algebraliens in this au hold animal traits or appearences, most are inspired off of bugs(Ex: One as a caterpillar, Two as a frog, Three as a scorpion, etc) and due to the changes in environment how they reacted or adapt to it. As they evolved to the current day they didn't need some of these traits. Algebraliens would then go into a state of "shedding" I call it, its like when a chao in Sonic Adventures upgrades(how I like to think of it). Three would've been bounded to the prison cells of the E.X.I.T. a while ago though and might be a little late to evolution, and soon just didn't bother with the concept. One, Two, and Three would've been considered the earliest numbers created by Infinity, Objectkind isn't really aware of this of course but the other algebraliens don't seem to care that much around Two. One isn't present at all in the Equation Playground due to banishment from "unknown circumstances." Some of the algebraliens just seem to have forgotten about her existence.
Little headcanon thing, but I thought this was reallyyy cute to think of. The Zeroes were actually a part of One's caterpillar form, though they were mostly mindless husks and invasive. Dut due to One's banishment they were seperated from her. Millions of years later the Zeroes evolved into becoming their own persons and gaining sentience. The Zeroes considered One(And possibily Three..tee hee) as a guardian to them.