(This was all part of an AU idea, though I wasn't exactly planning on doing anything with this idea. It was all just for fun.)
Undyne, also known as the Spear of Justice, gained her powers by retrieving a stolen purse from a thief and absorbing the SOUL fragment of Justice. She developed the power sense whenever someone’s in danger and the ability of super speed. Her weapon of choice is a gun loaded with little bullets in the shape of spears. She takes the appearance of a cowgirl from the braided hair to the cowboy hat atop her head.