These are just vector sprites. They're free to use, as long as you give credit. Press the space key to change the sprite. NOTE: The nails, regardless of appearance, are NOT violence, torture, threatening, bullying, insulting, breaking the law, or destruction. NOTE 2: The Shade is NOT meant to be witchcraft, violence, torture, black magic, threatening, bullying, insulting, vandalism, destruction, or scaring the little ones. NOTE 3: The Knight's appearance is NOT meant to be witchcraft, violence, torture, black magic, threatening, bullying, insulting, vandalism, destruction, or scaring the little ones. NOTE 4: The word "resting" is NOT meant to be violence, torture, threatening, bullying, insulting, vandalism, destruction, or scaring the little ones. NOTE 5: Anything that involves a forgotten crossroad is NOT meant to be violence, torture, threatening, bullying, insulting, vandalism, destruction, or scaring the little ones. NOTE 6: When you give credit, you MUST say that The Knight (Hollow Knight), the nails, and/or the Shade were/was made by Team Cherry, NOT me.
Credit to Team Cherry for Hollow Knight (2017 action-adventure videogame). I made the thumbnail and Metal Rat.