If she's not holding a katana, she will be holding one of those.
Those who have watched Shakugan no Shana will know that melonpan is: Shana's favourite food - sweet, hard crusted baked bread with typical cross hatch pattern on top.
Melonpan or meronpan (メロンパン), as described in Wikipedia, are inexpensive, sweet bakery products made from an enriched dough covered in a thin layer of crispy cookie dough. Having a shape that's like a melon, its name actually comes from two different languages: "meron" from English for melon, and "pan" from Portugese for bread (pão). Those sweet hard-crusted bread are what Shana loves.
Although it is originally not melon-flavoured, manufacturers and bakeries begin to add variation to melonpan with different flavours (mostly melon) or different fillings. In the more western regions of Japan, they're usually called "sunrise" (サンライズ) due to its different local appearance.
Melonpan can be seen now and then in anime
Images from Gelbooru
On the other hand...
Pronounced as "bo lo baau" or "bo lo bao" in Cantonese, pineapple bun (菠蘿包) is the Hong Kong equivalent of the Japanese melonpan, where "Bo Lo" means pineapple (菠蘿), and "Baau" or "Bao" means bread or bun (包). The checkered pineapple-like surface of the crusts gives name to this pastry. Just like melonpan, they're named after their appearance, not their ingredients or flavours.
Compared to melonpan, pineapple bun has a thin golden-brown crust made from egg and sugar, which is actually a seperate layer to the bun itself. I remember how I used to just peel off the crust and eat it bit by bit because it was so sweet (yet it's high in calorie) ^^;;
Despite the similarities between the two, melonpan and pineapple buns did not base their origin from each other. Maybe it's because of that I never see a melonpan in Hong Kong, nor do I see a pineapple bun in Japan.
Have you had a melonpan or a pineapple bun before? If so, how's it like for you?