OK a little context that got lost in translation: the Piko Piko Hammer is a squeaky toy. That's what "Piko" means. The joke isn't that Amy is a girl but uses a big manly hammer. The joke is that Amy tears up all of Robotnik's armies using a squeaky toy she won at a carnival.

So in that context a novelty Thanos sword, a sandal, and a toy crossbow that doesn't have a string fit in perfectly

THE CHANCLA!