Big Mom loves sweets, making all the islands under her protection pay her in whatever kind of candy they can produce. She seems to be obsessed with sweets to the point that her likes and dislikes are based on them, and she is willing to destroy a country for failing to deliver them. Despite this, she does not lose control when Luffy claimed to have eaten all of her candy; instead, she is perceptive enough to see through his lie to protect Fishman Island.[2] That aside, there are two things she dislikes: bitter treats, and invitees not showing up for her tea party.[10] She does not forgive those who refuse invitations to her tea parties, and will kill people precious to the invitee who does not attend as a "present".This demonstrates herself to be very brutal[11] As Vito put it "Even demons come when they are called by Charlotte Linlin."[10]
Although she does not seem greedy, Big Mom appears to have a rather capitalist mindset. She strongly believes that a pirate must accept no compromises or delays for something that they want. Pappug thinks she is protecting Fishman Island with a business perspective, since the deals made with the candy qualify as racketeering even though she prioritizes sweets over money and treasure. She initially refused an alternative payment of treasure when the candy tribute could not be met, and she also doubled the required amount of candy in exchange for a deadline extension of merely two weeks.
She appears to be quite ruthless, burning down a country when they failed to make their payment, disregarding any reason for the failure and rationalizing that she hates people who cannot keep their promises. She is infamous for decimating islands over slight infractions, and is voracious to the point of eating some of her own subordinates if hungry enough, showing signs of cannibalism.
She refers to herself with "ore" (おれ?), a very masculine way of saying "I", instead of the gender-neutral "watashi" (私?) that most other females use.[12]