Invent the new worst/most useless chess piece ever!

The kneght. Like a Knight but it can jump over pieces just once.

Made by me, I wanted to test if I could push board sizes.
Inspired by this game.

The invisi-piece. It's just an empty tile and just blocks the squares and you basically can't move it.

The transparent brick. Already exists

Nothing it is and does nothing

The fart. Immobilizes the nearest enemy piece for one turn only.

The pipe. Can't move and blocks your move, but every turn, summons a random piece from this forum thread that behaves as they usually do (on the forum thread, not in actual chess) except that they can't capture opponent pieces.

The toilet. It's like the Duck from Duck Chess

The jail guard - a piece that guards other eaten pieces that stay out of the board

the kign, it does literally nothing and can replace a regular king