plural folks effectively have two sets of customizable pronouns
you got the boring 3rd person pronouns, but 1st person system pronouns are more interesting because they're essentially the same concept as 3rd person ones. you have a default one that cis folks/singlets use (i / he/she), some people use other ones (we / they), you can use neopronouns (yes, those exist for 1st person too to differentiate between system-"i" and headmate-"i" and i know a couple of systems who use those!), and you can work around them (our system / [name of person])
in hindsight this is pretty obvious but woa we have a 2nd set of pronouns we can customize in the same way we can customize the gender pronouns. cool shit