[porphyra]

There's also the knook that combines the Knight and the Rook, which was hilariously invented as a meme on /r/anarchychess: https://anarchychess.fandom.com/wiki/Knook

[Izkata]

Here's a whole page of chess variants, many of which include such invented pieces: https://en.wikipedia.org/wiki/List_of_chess_variants

[klyrs]

Wherein the hex-knight is the anti-hex-queen.

https://en.wikipedia.org/wiki/Hexagonal_chess#/media/File:Gl...