Taiga Fujimura and Saber from Fate/stay night. Saber has the excuse that food replenishes her mana. Taiga doesn't.
Then again, the guy they hang around with is a Supreme Chef. Who would blame them for wanting some more munchies?
Of course, with the exception of the anime, the amount Saber eats is not that great.
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 that most people so she kept her girlish figure.