Alis- She's a teenager, so lots of junk food. Also, coffee.
Myau- Duh. Rodents and birds.
Odin- fried chicken
Lutz- I'm not sure he eats as much as he absorbs nutrients and moisture through, say, osmosis.
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Rolf- dried fruit (I picture him with a really quirky, picky diet: nothing with seeds, nothing with a grainy texture, nothing with a slimy texture, etc.)
Nei- Whatever's available.
Rudo- Comfort foods: Lasagna, casseroles, pot roast, mashed potatoes, anything slow-cooked.
Amy- pasta and starchy sweets
Hugh- sugary cereals
Anna- various stir-fry (She has a very regimented, restrictive diet: Whole foods, no processed stuff, no caffeine, very little alcohol.)
Kain- pizza, and anything covered in buffalo sauce
Shir- candy (She also enjoys grossing people out by eating weird things.)
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(skipping PSIII because there are too many characters)
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Chaz- macaroni and cheese
Alys- curry chicken and vegetables
Hahn- ramen
Gryz- garbage
Rika- bratwurst
Raja- omelets
Kyra- pancakes with lots of syrup