The pole dancer. It distract the enemy pieces by dragging them all - except for the King - to the square where it stands and paralyze them. The enemy kKing is on its own the rest of the game.
Invent the new worst/most useless chess piece ever!
The bomb: Can be placed on three random squares of the board by both sides, making six bombs, and any piece that lands on the bomb destroys itself and the bomb.

The Aquaman: rolls around the chessboard mumbling about how he has powers too. Always gets a new look which tries to re-invent him but it fails anyway. Moves only in the water area of chessboard, eg. at the 1st and 8th row. Is suprisingly useful though, because he can defeat pawns after they queen. Is terrible because he can only move from the 1st row to the 8th, or anywhere along said rows and can't leap over pieces. Does not give checks/mates to king

The Uhlan: Replaces the Queen. Moves like a Knight and kills like a King. Cannot kill an enemy Knight. If enemy pawn kills an Uhlan, it can promote to a Knight.
The Trump: Builds a wall that the other side has to pay for. But you can't control him and he does it at a random point during the game.

A so called Trump, is positioned in the middle of the board.
- can't move at all and can't be taken by another piece
- is just blocking all other pieces, they have to go around that piece
- only black has such a Trump piece, white doesn't, but the black pawns want to get rid of him
- Winning the game for any side is only possible after the Trump piece is gone

The backward pawn. It can only move two squares forward and two squares backwards and if you move it forward you must move it backwards.
it can't capture anything and it replaces all the pawns

The backward pawn. It can only move two squares forward and two squares backwards and if you move it forward you must move it backwards.
it can't capture anything and it replaces all the pawns
Would it be possible to move it one square backwards and then imagine it moving one more square backwards, then imagine it moving one square forwards and then moving it one square forwards - I think I'd prefer this move sequence if that would be alright?

The backward pawn. It can only move two squares forward and two squares backwards and if you move it forward you must move it backwards.
it can't capture anything and it replaces all the pawns
Would it be possible to move it one square backwards and then imagine it moving one more square backwards, then imagine it moving one square forwards and then moving it one square forwards - I think I'd prefer this move sequence if that would be alright?
No
sounds great for a chess.com variant.