HOW DO YOU DO THAT?
My Custom Variant: Upgrade Chess

HOW DO YOU DO THAT?
I have friends who like chess variants, and I have a 3d printer. I've printed all the chess pieces, all the fairy chess pieces on chess.com, and some custom fairy chess pieces using my 3d printer. I've printed several chess boards, some portable some not, and in the travel sets, I have fewer kinds of fairy pieces and instead have cards with moving instructions that I match to a type of piece. More common fairy pieces like archbishops or chancellors still have dedicated pieces, but less commonly used ones like the Alibaba-rider or the Xiangqi horse have cards, and we just assign a kind of "blank" fairy piece to them whenever they're used.

so if they were two or two+ {ex3,5,8} kings then how would checks/checkmate work
take most of them and checkmate the last one
They promote to non-royal kings.
that would make them not very good
How so? Kings can move in any direction, having them not be royal just makes them more useful…
queens would be better
I'm playing it irl with friends. Not every custom variant on these forums has to be a submission.