başçı

/baʃtʃɯ/

Cases

SingularPluralWhen to use it
nominativebaşçıthe leaderbaşçılathe leadersthe plain dictionary form — the doer of the sentence
genitivebaşçınıthe leader'sbaşçılanıthe leaders'the owner — whose it is
accusativebaşçınıthe leader (as the object)başçılanıthe leaders (as the object)a specific, known object — whom or what
dativebaşçığato the leaderbaşçılağato the leadersdirection or recipient — to where, to whom
locativebaşçıdaat / in the leaderbaşçıladaat / in the leaderswhere it is; also having — mende bar, "I have it"
ablativebaşçıdanfrom the leaderbaşçıladanfrom the leaderswhere 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
mybaşçımmy leaderbaşçılarımmy leaders
yourbaşçıngyour leaderbaşçılarıngyour leaders
his / herbaşçısıhis / her leaderbaşçılarıhis / her leaders
ourbaşçıbızour leaderbaşçılarıbızour leaders
you all'sbaşçığızyou all's leaderbaşçılarığızyou all's leaders
theirbaşçılarıtheir leaderbaşçılarıtheir leaders

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