The most important aspect of the robot leg is not about choosing a list of irl guns to take a reference of but rather coming up with the distinguishable shape that works with her silhouette. Then you can put whatever bs gimmick on it
that's what I meant whenever I ask people about the leg design idea. Also while her robot gimmick often involves firearm ideas, I'm opened to more goofy and cool mechanics, maybe like militarized looking daily objects/gadgets( perhaps a spray bottle inspired design )