Straight: Ichigo, an adorable-looking young girl, likes to lug around a huge axe.
Exaggerated: Her Weapon of Choice is actually larger than her, with an Absurdly Sharp Blade with all sorts of wicked curves and spikes on it. It's powered by the souls of other previously slain adorable looking young girls.
Downplayed: Ichigo carries a pocket knife or any other mundane (but still dangerous) weapon.
Small things can be horribly frightening too. Case in point? Ichigo's weapon of choice is syringes. What's in them may vary, but her favorite seems to have some halucinogenic properties in addition to being poisonous.
Or: Ichogo's BFS is covered in sparkles, gems, and ribbons. She calls it Billy. "My favorite color is pink, but Billy likes red better."
Zig Zagged: Ichigo constantly makes ominous threats about her secret weapon... Which turns out to be a frilly pink wand... That fires gigantic pink nukes... Which nonetheless inflict a Non-Lethal K.O. at the very worst. Furthermore, Ichigo turns out to be a crossdressing Ryuuji.
Ichigo does not carry any weapon at all.
Ichigo's weapon does not immediately bring the word "bloodbath" to mind.
Enforced: The creator likes the visual contrast of a sweet little girl carrying a dangerous-looking weapon.
Lampshaded: "You idiot! Of course she has a scary-ass weapon! Look at how adorable she is!" Cut to Ichigo being supercute.
Invoked: Ichigo has had enough bad experiences with people who think "small and cute" means "easy target" that she's decided to arm herself with something a little more intimidating.
Exploited: Alice and Bob recruit Ichigo for their casino robbery because they figure no one will bother checking a cute little girl for weapons.
Defied: "How do you expect me to use that? That axe is as big as I am! Give me the bow."
Ichigo: "Hey, cool, a team of world-saving heroes! Can I sign up, please?" Ryuuji: "Er... you aren't gonna whip out a BFS and go all psycho on us, right?" Ichigo: "I get that a lot... but don't worry, I use amachine gun!"
Deconstructed: The weapon Ichigo uses is unsafe or unwieldy for someone of her stature. Even when she's not accidentally hurting herself with her weapon, she only really carries it for the intimidation value.
Reconstructed: She knows a)how to use her weapon safely and effectively due to special training, and b)that no one will expect her to be able to use it.