Telugu Declension. Telugu nouns have six classes (A-F), each with their own way of declining the noun stem. Read more here, under "Oblique Stem Formation": https://en.wikipedia.org/wiki/Telugu_grammar#Nouns
The nominative case is simply the default, underlined form of the noun.

All Telugu nouns have the nominative plural ending of "-లు".

Case/Form Singular Plural
Nominative Undeclined Form Undeclined Form + Plural Ending
Accusative {{{2}}}ని ({{{2}}}ni) {{{2}}}లుని ({{{2}}}luni)
Instrumental {{{2}}}తో ({{{2}}}tō) {{{2}}}లుతో ({{{2}}}lutō)
Locative {{{2}}}లో ({{{2}}}lō) {{{2}}}లులో ({{{2}}}lulō)
Inessive (inside) {{{2}}}లోపల ({{{2}}}lōpala) {{{2}}}లులోపల ({{{2}}}lulōpala)
Dative {{{2}}}కి ({{{2}}}ki) {{{2}}}లుకి ({{{2}}}luki)
Genitive {{{2}}} {{{2}}}లుల ({{{2}}}lula)
Oblique {{{2}}} {{{2}}}లు ({{{2}}}lu)
  NODES
Note 1