I am building a toop-down shooter using Game Maker Studio 2. I need the weapons to be separate from the charcter sprite. Are your weapons separated from the characters?
This set doesn't include weapons. They're more designed for use in JRPGs, but could be modified.
Here's a very old free release I made that has what you are looking for, good for prototypes: https://finalbossblues.itch.io/pixel-shooter-towers-asset-pack