ışarıwçu

/ ɯʃarɯwtʃu /

Cases

SingularPluralWhen to use it
nominative ışarıwçu the one who smiles ışarıwçula the one who smileses the plain dictionary form — the doer of the sentence
genitive ışarıwçunu the one who smiles' ışarıwçulanı the one who smileses' the owner — whose it is
accusative ışarıwçunu the one who smiles (as the object) ışarıwçulanı the one who smileses (as the object) a specific, known object — whom or what
dative ışarıwçuğa to the one who smiles ışarıwçulağa to the one who smileses direction or recipient — to where, to whom
locative ışarıwçuda at / in the one who smiles ışarıwçulada at / in the one who smileses where it is; also having — mende bar, "I have it"
ablative ışarıwçudan from the one who smiles ışarıwçuladan from the one who smileses where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
my ışarıwçum my one who smiles ışarıwçularım my one who smileses
your ışarıwçuŋ your one who smiles ışarıwçularıŋ your one who smileses
his / her ışarıwçusu his / her one who smiles ışarıwçuları his / her one who smileses
our ışarıwçubuz our one who smiles ışarıwçularıbız our one who smileses
you all's ışarıwçuğuz you all's one who smiles ışarıwçularığız you all's one who smileses
their ışarıwçuları their one who smiles ışarıwçuları their one who smileses

The overlap in the last rows is real, not a mistake: ışarıwçuları can mean "his / her one who smileses", "their one who smiles", or "their one who smileses" — context decides.