One appears to be nonchalant, calm and seemingly helpful. She constantly observes the contestants to learn their vulnerabilities, which she uses to blackmail them into signing her deals, often for rewards she 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, 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 andReality Warping: She can effortlessly manipulate her surroundings, teleport objects, and rewrite physical boundaries at will.Size Alteration: One can grow into a towering giant or shrink instantly to adapt to any situation or intimidate her targets.Soul Trapping & Absorption: Her most terrifying power allows her to forcefully absorb other characters directly into her body, trapping them indefinitely unless a contract is fulfilled. One appears to be nonchalant, calm and seemingly helpful. She constantly observes the contestants to learn their vulnerabilities, which she uses to blackmail them into signing her deals, often for rewards she may or may not actually give.
