Other than cha-soba, I also mix some charcoal soba for extra touch :p Keroppi eyes make of hard boiled egg (white) and nori. Red cheeks make of crabstick.
For side dishes have pea sprouts, flower cheese sausage that you can click HERE for tutorial and mandarin oranges. Some soy sauce for the soba at the froggy sauce bottle.
I hope you like this simple Keroppi Bento ^_^