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One appears to be nonchalant, calm and seemingly helpful, but is very manipulative and malicious under the surface. They constantly observe the contestants to learn their vulnerabilities, which they use to blackmail them into signing their deals, often for rewards they may or may not actually give.

One is easily irritable and gets annoyed when people are hesitant or resistant to her and gets enraged when people defy her, like Donut and Leafy do in "Last One Standing". The episode shows One to be incredibly cruel and manipulative, showing no remorse for the destruction and deletion of contestants that she is responsible for, as well as convincing Pencil to give her all of Two's and Four's powers via capturing her and thus making an upheld deal with her. She is also very power-hungry, conspiring to take Two (and later Four's) power and gleefully fidgeting with it when she finally gets it in "Last One Standing". Overall, One is shown to be vengeful, manipulative,And Hot Headed (if they try or even think about ruining her plans/she will be enraged so easily).

In the past, prior to her isolation, One appears to be a nice but lonely person, eager to make friends with the other Algebraliens, eventually befriending Three. However, she also acts impulsively and doesn't realize what she's doing until it's too late, killing Three for betraying her before desperately trying to fix it. She tries hard to patch things up that she did wrong, in fear of not being accepted and remaining alone. After being locked up inside the Moon, her desire for revenge against the others (especially Four) grew, although she still showed remorse for her actions.

Even in the present day, she is still hurt by her loneliness, evident when she forcefully kicked Leafy out of her dimension after her constant remarks of One being alone and sad, meaning she still holds some amount of insecurity despite her antagonistic behavior.

Appearance: One is a light blue Arabic numeral one (1), being based off the design of the "1" with a lower serif (𝟷), likely taken from the original Minesweeper. 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.

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.

One’s room appearance: From what has been seen, most of the places inside of this dimension seem to have a dark blueish night sky, with stars dotted around the place. The sky shows the design similar to Starry Night by Van Gogh.

As of Alone, the place is trashed by Leafy. One's chair is ripped by Leafy with a knife, papers and books are strewn on the floor after Leafy tossed them out of the bookshelf, and numerous pieces of equipment like the television are cracked or damaged.

The room appears to be some kind of observatory, overlooking a body of water. It's unknown if they’re actually walls, but the floor is a shiny translucent yellow.

On the left side sits a bookcase and a plant, while on the right side is a dead tree, a baby mobile, a floor lamp, and a telescope. Finally, at the centre, there is a siting area that consists of an armchair, a small coffee table, and an office chair.