Same, but I think multiple kinds of royals would be better than just this kind. For example, maybe one kind has to be protected, and if only one of them is checkmated or multiple are checked and you can't protect all of them, you lose, which we'll call "Normal." There could also be "Survivor" royals, where you don't lose the game until they are all captured or checkmated, and you only have to respond to checks if all of them are in danger. A slightly stranger kind would be "Passing" royals; they can "pass the crown" to other pieces, making the one "receiving the crown" now royal and the one "passing the crown" no longer royal, unless the "receiver" is already royal. "Passing" royals could also be combined with others, meaning you could have a piece that is a passing survivor royal, and the "receiver" would become a passing survivor royal. There could of course be other kinds, but these are just the first ones I thought of.
Multiple Royals
I was also having the idea that there could be commanders, that would be for a particular troop within the army. If a commander is in check then the commander must be taken out of check, and if the commander cannot be taken out of check then the commander would be checkmated and all the members of the commanders troop would immediately die but members of the same army as the commander but not in its troop would survive. Only members of the commanders troop would be allowed to get the commander out of check. Also if a royal and commander are both in check and only one could get out of check then getting the royal out of check would take precedence to getting the commander out of check and the commander would be checkmated.
with commanders you should just make it capture the king to avoid complications.
I think we should have the option to have multiple royals in the same army, and with the options being for the army to die when one of the royals is checkmated, or for the army to require all royals to get checkmated in order to be killed.