A character sando is less a recipe than a craft project that happens to be edible. The form takes an ordinary filled sandwich, usually a soft shokupan with something pale and mild inside, and turns its visible face into a picture: a cat, a bear, a panda, a familiar Sanrio mascot rendered in cheese, nori, ham, and cucumber. It belongs to the world of the decorated bento, where a packed lunch is partly food and partly a small act of affection from whoever assembled it. The eating is almost beside the point until you are hungry, and then it is a reasonable, capable sandwich with a face.
What makes one work is restraint in the filling and precision on the surface. The interior wants to be neutral and stable so it does not bleed into the artwork or soak the bread before the lid comes off the lunchbox. Egg salad, ham and a thin spread, a smear of cream cheese, processed cheese: any of these holds without weeping. The picture is built from cut shapes laid on the top slice, nori punched with a craft punch for eyes and a smile, cheese trimmed into ears, a dot of ketchup or a circle of carrot for a blush. A good one has clean edges, pieces that sit flat and stay put, and a face that still reads after a few hours in a bag. A sloppy one curls at the nori, slides its features off-center, and turns the cheese translucent and greasy by lunchtime, so the bear looks like it had a hard morning too.
The technique scales from a parent's quick lunchbox bear to elaborate showpieces that take longer to assemble than to eat. Kyaraben, the broader genre of character lunches, treats the sandwich as one panel among rice balls and shaped vegetables. The fillings underneath range across the whole catalog of soft sandos, which is the honest reason this entry stays general: the egg, fruit, and cream versions each behave differently and each deserves its own article rather than being crowded in here.