One

One is a light blue Arabic numeral one (1), being based off the design of the "1" with a lower serif (𝟷). The upper and lower serifs of the "𝟷" are misaligned, the former more far off to the left. Unlike almost all well-known algebraliens, One doesn't have any arms, hands, and fingers.

Sometimes, One's eyes appear to protrude outside her body, and on some occasions, they appear slimmer and more tilted, including when she is enraged.

She has the following powers and abilities:

• Nigh-Omnipotence: One has been shown to possess near-limitless power, despite admitting to being weaker than Two and, by extension, Four. This is supported which shows that Four has claimed their power from a larger piece of Yoylite and shared this power with Two. The line likely refers to her inability to properly recover Three, and her belief that claiming more power would aid her in doing so. Nonetheless, even without Two's power, she is still unimaginably powerful, showing near-unrestricted control over space, time, matter, and energy. She can seemingly grant any request made in her deals, such as restoring lost limbs or reversing changes to someone's personality. Her power is most prominently displayed later, when she stabilizes reality with just a snap before the rift in space-time opened. Overall, One can achieve almost anything imaginable, showing that even if she falls short of Two and Four's powers, she remains a godlike entity in her own right.

• Super strength and/or telekinesis: One uses telekinesis to throw rocks at an opening in the Moon in order to escape. However, her ability was clearly limited at the time, as she was unable to breach the Moon on her own, while Lightning’s strike created a crack that she could take advantage of. She used telekinesis to hold a contract list. She is also able to easily kick Earth away, though this was shown after she gained most of Two's and all of Four's powers. Doing this would take over 100 quadrillion megajoules of power, or 100 billion terajoules of power.

• Nigh-Omnipresence: One can be seen being in people's dreams and hiding in plain sight. One is still in reality, meaning she can be in multiple places at the same time.

• Technology/Electricity manipulation: One is able to manipulate a robot's mind, and it's implied that they're also capable of making her personality even more destructive. She can also appear inside screens and monitors.

• Reality warping: One has the ability to change, create, or even destroy parts of any places indirectly only by using a miniature of the location she wants to warp in her dimension. She is also able to make the rift in space-time shoot out reality-warping lightning bolts via her miniature.

• Anomaly removal: She was powerful enough to restore the universe to a more stable state before the rift in space-time opened, effectively undoing much of the damage caused by time travel. However, since the rift itself was only reduced to a manageable level for Black Hole rather than erased entirely, this suggests either she lacked the strength to completely fix it, or, more likely, she chose not to, keeping the rift intact as leverage over her future victims. This is consistent with her willingness to endanger all of existence itself, knowing she remains completely safe within her own dimension.

• Atmokinesis/Weather manipulation: With her ability to warp reality, One can change the weather and create storms to cause havoc.

• Chronokinesis/Time manipulation: One is revealed to be able to remove people from the timeline. It is clear, however, that victims to this ability are not completely removed from the timeline as if they were never there, even after their removal.

• Teleportation: One is able to teleport herself and other people.

• Super speed: During the Team Swap, One runs around shuffling the contestants, finishing in less than a third of a second, all while Two is looking away. By the time that someone says something, One has jumped back into the bush, leaving Two and all of the contestants oblivious to what happened.

• Conjuration: One can create objects out of thin air, as seen when she conjures a document, creating body parts to offer, or creating a remote while talking to show her what happened to the eliminated contestants she took.

• Pocket dimension: One can create pocket dimensions and manipulate the contents at will.

• Black hole immunity: As One was shuffling the contestants, she moves Black Hole effortlessly without being warped by his gravity. In "Last One Standing", One teleports Black Hole to her pocket dimension without any issues.

• Body manipulation: One's foot extends and grows in size, in order to grab contestants.

• Power draining: She drains the Yoylite pieces of their time traveling powers, and it's implied she can do this to other Algebraliens as well, either via her contracts or draining them of their powers forcefully.

• Obfuscation: She is able to ensure that certain contestants, and even Four, cannot comprehend the research that the others have done on her, by obfuscating the contents of the whiteboard along with research notes. The obfuscation effect can be reversed if powerful enough.

• Dismemberment (possibly): She is able to use her own telekinesis to take arms and legs by force. This may just be a use of her telekinesis rather than its own ability.

• Almost all of the Algebralien's powers: A contestant is able to sign One's deal to give away all of her power, which were from Two and Four. However, more of Two's power lingers out there, meaning she does not have it all. Her on-screen uses of these powers include shooting lasers out of her eyes that easily destroy faraway planets, killing aliens, bending, warping, and kicking Earth, and flying through space at super-speed. Later, One absorbed the power of Nine, Five, Seven, Eight and Ten.

• Passive Aura: After successfully gaining all of Four’s and almost all of Two’s power, One gains a bright green and light blue aura with dark blue sparkles, with an extra transparent white one also sometimes appearing (though not from Nine). This is from the sheer power she’s possessing. This can also leave a colorful trail whenever she travels fast. She does have the ability to make the effect invisible whenever she wants. When using her powers, she can either make the aura much brighter or shoot lasers from her eyes with those colors. Although this seems to be exclusive to Two and Four's powers, as she doesn't seem to receive any extra colors from the other Algebraliens' absorbed powers.

• Shapeshifting: One is able to transform into anyone and anything.

• Size Manipulation: One turned herself into a giantess.