kirpi

/ kirpi /

Cases

SingularPluralWhen to use it
nominative kirpi the hedgehog kirpile the hedgehogs the plain dictionary form — the doer of the sentence
genitive kirpini the hedgehog's kirpileni the hedgehogs' the owner — whose it is
accusative kirpini the hedgehog (as the object) kirpileni the hedgehogs (as the object) a specific, known object — whom or what
dative kirpige to the hedgehog kirpilege to the hedgehogs direction or recipient — to where, to whom
locative kirpide at / in the hedgehog kirpilede at / in the hedgehogs where it is; also having — mende bar, "I have it"
ablative kirpiden from the hedgehog kirpileden from the hedgehogs 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 kirpim my hedgehog kirpilerim my hedgehogs
your kirpiŋ your hedgehog kirpileriŋ your hedgehogs
his / her kirpisi his / her hedgehog kirpileri his / her hedgehogs
our kirpibiz our hedgehog kirpileribiz our hedgehogs
you all's kirpigiz you all's hedgehog kirpilerigiz you all's hedgehogs
their kirpileri their hedgehog kirpileri their hedgehogs

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