Being addicted to power, Candy always wants to practice making better and more destructive fire attacks for better power, wanting to be one of the most powerful Fatpires.
To achieve this, Candy constantly needs fat to be able to create fire attacks and she needs a lot of fat to be able to last over time or perform stronger attacks.
This is why Candy goes as far as exaggeration by becoming bigger and bigger, always wanting to store as much fat as possible in her, to let off steam in these fiery attacks, even if it means appearing ridiculous because of her size and forgetting to also keep enough fat to feed herself, but she doesn't care. For her, the feeling of being powerful is enough for her and she always wants more, loving the violence and the numerous fire techniques that she invents with each use.