pero

/pero/

Cases

SingularPluralWhen to use it
nominativeperothe nibperolathe nibsthe plain dictionary form — the doer of the sentence
genitiveperonuthe nib'sperolanıthe nibs'the owner — whose it is
accusativeperonuthe nib (as the object)perolanıthe nibs (as the object)a specific, known object — whom or what
dativeperoğato the nibperolağato the nibsdirection or recipient — to where, to whom
locativeperodaat / in the nibperoladaat / in the nibswhere it is; also having — mende bar, "I have it"
ablativeperodanfrom the nibperoladanfrom the nibswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
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
myperommy nibperolarımmy nibs
yourperongyour nibperolarıngyour nibs
his / herperosuhis / her nibperolarıhis / her nibs
ourperobuzour nibperolarıbızour nibs
you all'speroğuzyou all's nibperolarığızyou all's nibs
theirperolarıtheir nibperolarıtheir nibs

The overlap in the last rows is real, not a mistake: peroları can mean "his / her nibs", "their nib", or "their nibs" — context decides.