A complaint can be raised by an owner, co-owner, tenant, director in a company that’s an owner and (I think) a mortgagee and a ‘convenant chargee’ (whatever that is).
If a wife*, lover, ex, bestie, parent, sibling or child isn’t on the Strata Roll, then they would have to establish their proprietorial status through another court first.
In NSW, even the co-owner who is named second on the roll has slightly less standing that the co-owner who is named first, so someone who isn’t named at all, either on the roll or contractually (like a tenant) has Buckley’s chance.
*I’ve actually corrected this in a more recent post (above) – a spouse who is also an occupant of the lot is probably considered an “Interested Person” under that Act and therefore has the right to take action related to the management of the strata scheme. But someone in an informal relationship and, especially, who is not an occupant of the scheme, would have to prove by some other means that they had a right to be heard – JT.