Sweet Tooth

Anime and Manga

 * Mira in Asteroid in Love. At home she drinks coffee with five sugars. Away she drinks a canned coffee that has a much sugar--by volume--as Coca-Cola.
 * Betrayal Knows My Name: Tsukumo has one.
 * Black Butler: Ciel, though it certainly helps that Sebastian is a very good cook.
 * Tsuzuki Asato in Descendants of Darkness is rather infamous across the Bureau for his cake addiction.

Western Animation

 * In 6teen, Caitlin is this for chocolate. It's revealed in "Enter The Dragon" when on her period, this gets applied to Nikki instead (still with chocolate).
 * Mabel Pines from Gravity Falls loves her sugar. She has to get all that energy from somewhere.
 * Cody from Total Drama is addicted to candy.