A system to classify chess variants

Here are a few favorites I play with friends and family. If any of you decide to try any of these pieces let me know what your thoughts are.  

(Pawn) Knight Squire= move forward or sideways 1 square. K.S. can only capture forward 1 square. When adjacent to a Ranked Knight it can trade places with the Knight if the Knight is captured.

(Pawn) Anti-Pawn=Moves diagonally-forward 1 square. Captures one square forward. (Can move 2 squares on the first turn.)

(Pawn) Legionnaire= Moves as a King. Captures one square forward.

(Pawn) Swordsman= Moves 1 square diagonally captures 1 square orthogonally.

(Pawn) Axe Man= Moves 1 square orthogonally. Captures 1 square diagonally.

(Knight) Teutonic Knight= Moves as a Standard Knight, captures as a standard King. Pieces more than two squares away cannot capture the Teutonic Knight.

(Knight) Dark Heart= Moves/Captures as a standard Knight. After moving, (non-capturing) if there is a piece located another knight move away from the Dark Heart's destination square, then that piece may be captured. The Dark Heart does not actually move to the square occupied by the captured piece, thus it captures 'from afar.'

(Bishop) Minamoto Samurai= Moves 1 square diagonally. Can capture on any square of its color within 2 squares around it. Can jump over pieces.

(Bishop) Taira Samurai= Moves 1 square diagonally. Can capture on any square that is of a different color than the one it occupies within 2 squares around it. Can jump over pieces.

(Rook) Royal Musketeer= Moves/captures 2 squares as a Rook. When R.M. captures an enemy piece it immediately returns to the square it attacked from.

(Rook) Strategos= Cannot capture. Moves as a standard rook. Enemy pieces that are 1 knight’s move away cannot capture. Friendly pieces that are 1 knight’s move away cannot be captured.

(Queen) Sorceress Queen= Moves as a standard Queen. Cannot capture. Adjacent enemy or friendly piece can be moved to any empty square on the board. Except the opponent’s back row. (counts as a move.)

(Queen) Cardinal=Moves/captures as both a standard Bishop and a standard Knight. Cannot be captured by ranked bishops. *COORDINATOR- with friendly Bishops

(Queen) Iron Queen= Moves/Captures as a standard Queen. Can only capture the enemy King or be captured by the enemy King

(B/R/K) Princess= Moves/Captures as a standard King. Adjacent friendly pieces are temporarily “Crowned” (If the king is captured via checkmate the Princess becomes the new King. 

(B/R/K) Prince= Moves/Captures as a standard king. Adjacent friendly pieces are temporarily “Knighted” (If the king is captured the Prince becomes the new king.

I call the crowned rook a "Frook" (Ferz + Rook)