Msr = Mr/Mrs (pronounced ‘mezzr’)
Msrs = Messieurs/Mesdames (pronounced ‘mezzrs’)

Seh = He/she
Hir = him/her/(it)
Hirself = himself/herself
Hirs = his/hers/(its)
(I’d continue to use the words ‘it’ and ‘its’ as separate)

Seh said = He/she said
It’s hirs = It’s his/hers
It’s hir = It’s him/her
Hir clothes/name = His/her clothes/name