The Bomb.
There are 1 bomb on each side. They start on a6 for black and h3 for white. They can only once and when they move side who moves it has to take off his / her queen. When a piece captures it , the side that captured it loses. If a pawn captures it , the side that captures it has to lower his / her time to 1 min. If the time control is 1 min , then the side that captured the bomb will lower his / her time control to 10 sec.
can move anywhere and must capture 1 piece of yours every 10 moves and 5 opponent pieces every 10 moves.
The Scared Destroyer. When the game starts it starts knocking over all other pieces and then calls it a draw
I am back 
The Repeater: This piece moves one square and moves back to the original square it was on. So it stays in one place for the entire game.
The Stone - This piece does not do more than a big rock can do. It stays on one square without moving in the entire game.
if you find good ideas you can also put them in CREATE THE BEST/WORST CHESS PIECES
(Worst) - The peasant
Exchange - 0.5
Moves 6-9 squares diagonally, unless blocked by any piece, can't capture anything except for a fez, pawn, or peasant
(Worst) The Horse
Exchange - 0.5
Can do 2 or 3 knight moves unless blocked at all by any piece
(Absolute Worst) aaaaa
the aaaaa can't move. it can't be captured so it basically blocks your path
The J1407b: the other pieces get distracted by this exoplanet’s magnificent rings.
The expanding chess board. After every move, the board becomes 10 squares bigger in each direction and all pieces move away from the center by a proportional distance.
The chicken: Watches the game until the endgame. Then it goes and teleports to other chess boards on Earth saying spoilers for all the big upcoming movies.
The LIMITER: It keeps track of every square where each piece has moved and will not let it move to that square a second time in the same game. It always occupies the last square where the last piece moved from , cannot be taken or have another piece land on that square till it moves on to another square.
The MURPHY: It stays off the board until a checkmate or stalemate occurs or until a repetition of moves occurs that could end the game, then it replaces the piece that made the game ending move as a Knight that is forbidden to give check , jump over or take another piece.
The KIBITZER: If any position occurs on the board that has been reported, the Kibitzer (another piece that is stationed off the board) starts talking out loud about that game. Below is an example:
1. e4 Kibitzer for white sa
The horn. There are 4 horns, 2 black and 2 white. They start in the middle 4 squares. They cannot move, and the only piece that can capture it is the king