Adjectives, determiners and pronouns agreed with the noun they qualify in case, number, and gender, although without a separate vocative form.
Feminine nouns which end in a consonant do not have vocative forms.
There is a difference in usage between vocative forms of common nouns and proper nouns.
The vocative form of a noun is the same as the nominative except for second-declension nouns ending in -us.
There exists a special vocative form for the nom.
Proper nouns usually also have vocative forms, even though they are used less frequently.
In the latter case the vocative form is often also incorrectly used as nominative to refer to bishops and the patriarchs.
Note the lack of second- and third-person vocative forms.
The long ī is generally reserved for the vocative forms of these names, although in Sanskrit the vocative actually takes a short "i".
Pronouns were declined similarly, although without a separate vocative form.