The only canonical appearances of Algebralians are from Battle for Dream Island. Their appearances in the pre-BFDI comics and XFOHV are considered not canon, meaning they are not part of the central universe and timeline of events.
Variables are based upon mathematical variables. Most use or are represented by letters in the Latin alphabet. X was introduced in "X Finds Out His Value" as the very first variable, with N Variable, Y Variable, and Z Variable being introduced in "The Number Playground Chronicle!".
Irrationals were introduced in "The Number Playground Chronicle!". One member, Pi Irrational, served as a journalist and writer for the titular newspaper, writing on articles such as Five and Three not catching balls. Irrationals reappeared in Pie vs Pi and had a larger role.
Imaginary Numbers were introduced in "Pie vs. Pi: The Pi Day Massacre". There is currently only 1 known imaginary number, being i.
The Number Playground Chronicle![]
These species of Algebralian have exclusively been seen in The Number Playground Chronicle! and have not been confirmed to exist within other canons containing Algebralians.
Polygons were introduced in "The Number Playground Chronicle!". They are based upon the first 11 polygons by sides minus heptagon (7 sides) and decagon (10 sides). They did not make any more appearances after their debut.
Operators were introduced in "The Number Playground Chronicle!". They are based upon mathematical operators. Divide Operator is the only operator to have been physically seen.
Fractions were introduced in "The Number Playground Chronicle!". They are the only species introduced in the aforementioned comic to have never been visually depicted.
The term "Algebralian"/"Algebralien" was initially coined by fans of the show. It was later adopted by Cary Huang himself, solidifying the species' nickname as official.
Algebralians are the only characters (and species for that matter) in the series who do not identify themselves with a specific gender.
Algebralians might have very fragile skin. In BFB 17, Two claims that glue can damage an Algebralian's pelt, even though they never state how.
Algebralians appear with sclerae (the whites surrounding their pupils), whereas the anthropomorphic objects are shown only with pupils.
Algebralian digits 1-8, with the exception of five are colored based off of numbers from the game Minesweeper. This is stated in the credits of X Finds Out His Value.
Some algebralians have been shown to be able to retract limbs. In some scenes, Two and Pi have been seen without certain limbs that they usually have.
Calculations[]
As most algebralians are numerical characters, they are able to fuse and subtract with each other as if they were mathematical sums. So far, six instances of algebralian calculations have been shown on the channel.
"Four Goes Too Far", where Four and Donut (acting as Zero) multiplied to create Zero, eliminating Four. The equation appeared to not have a proper multiplication symbol (×), though it is theorized that A Better Name Than That's sled acted as a multiplication bracket.
It is confirmed in this video that, whenever two algebralians combine, part of one algebralian enters the other: such as Six and Nine becoming a blue-grey gradient of 15, and Four becoming Donut's filling.
Thanks for 2,000,000 Subscribers!, where Two divided Fourteen into two green sevens. And where Seven and "Green Seven" were added together to create Fourteen. It also had two green sevens added back to Fourteen off-screen.
