Tamagoyaki is Japanese rolled omelet. It's often served in Japanese-style breakfast and is the most popular bento food.
Rice balls are called onigiri in Japanese. Rice balls are usually shaped into rounds or triangles by hands. Onigiri are often put in Japanese bento lunch boxes.
Inarizushi is known as brown bag sushi. Sushi rice is packed in seasoned aburaage (fried tofu) pouches. Inarizushi is easy to eat, so it's often put in a bento lunch box.
Marinated and pan-fried chicken is easy to make and is a good bento food. Cut chicken into bite-size pieces before packing.
It's a quick pickle with hakusai which goes with steamed rice.
Rabbit-shaped apple pieces are often packed in bento boxes to please kids.