Emi Ibarazaki from Katawa Shoujo. At one lunchtime at the rooftop, she brings a lunchbox who is twice as larger as Hisao's and Rin's. Justified as she's the local Passionate Sports Girl, thus does a lot of exercise and burns more calories than most people so she kept her girlish figure.
Emma Cee from Halloween Otome is known for this to her companions. In fact, her frequent visits to the kitchen grant her a chance conversation with her host.
Though with Ema, it may more of a Trademark Favorite Food deal - Maya mentions eating quite often, and Ema is only ever seen eating Snackoos. Though she does have a bag of them with her near constantly.
Licia in Strawberry Vinegar, especially around rice. However, she learns the limits of her body when she gets sick one morning as the consequence of overindulging for three days straight on human food.
In Sickness, Misa devours a bunch of meat while on a picnic with Suoh (leaving him to his dismay with mostly vegetables) and ends up making herself sick.