I wouldn't say so. For me a chess piece has to be used in a chess or chess variant, or a fairy chess problem. Otherwise, anyone could "invent" 10 chess pieces per day as there is no limit in the possible combinations. I suggest that you invent chess variants instead, where you may try to manage the inclusion of your pieces.
I'm doing so, with some of these as well as others. I specifically just started one with the Magus, Castellan, and Lady in Waiting (as well as Abbot and Bodyguard), and I may add the Fibnif and Sniff to that one; the big one I'm developing offline includes the Pirate and the Ghost, along with the piece I'll be presenting for today and several others; and my brain is developing a couple more that would include the Hangman and Rabbit, among others. I have some vague ideas for most of the others (specifically the Midnighter, the Samurai, and the Kimono Dragon), but something will come of them.
I am sometimes presenting things purely for laughs, like the Anvil; for illustrative purposes, like the Thunder; or for context with something else, like the Thoroughbred. Those are special cases, though.
I'm doing so, with some of these as well as others. I specifically just started one with the Magus, Castellan, and Lady in Waiting (as well as Abbot and Bodyguard), and I may add the Fibnif and Sniff to that one; the big one I'm developing offline includes the Pirate and the Ghost, along with the piece I'll be presenting for today and several others; and my brain is developing a couple more that would include the Hangman and Rabbit, among others. I have some vague ideas for most of the others (specifically the Midnighter, the Samurai, and the Kimono Dragon), but something will come of them.
I am sometimes presenting things purely for laughs, like the Anvil; for illustrative purposes, like the Thunder; or for context with something else, like the Thoroughbred. Those are special cases, though.