-s (2) ending for the mysterious case sometimes called "respective", actually probably a shorter variant of the locative in -ssë. Pl. -is, dual -tes, partitive pl. -lis.
Quenya
-ssë
-ssë
-ssë
suffix. abstract noun
-ssë
suffix. locative ending
-ssë
suffix. himself, *herself, itself
-ssë
respective
-ssë
at
-ssë (1) locative ending (compare the preposition se, sé "at", q.v.); in Lóriendessë, lúmessë, máriessë, yalúmessë (q.v. for reference); pl. -ssen in yassen, lúmissen, mahalmassen, símaryassen, tarmenissen, q.v. Pronouns take the simple ending -ssë, even if the pronoun is plural by its meaning (messë "on us", VT44:12). The part. pl. (-lissë or -lissen) and dual (-tsë) locative endings are known from the Plotz letter only.
-ssë
he loves himself
-ssë (2), 3rd person sg. reflexive ending, melissë "he loves himself", possibly also quernessë *"he turned (himself)" (VT49:20-21). Compare -ttë #2. The ending -ssë* seems prone to confusion with the locative ending; an alternative wording would be the analytical construction melis immo with a separate reflexive pronoun. Tolkien himself changed quernessë to quernes immo **(VT49:20-21).
-së
suffix. he, she, it
-tsë
-tsë
-tsë, dual locative ending (Plotz); see -ssë
-s(së)
suffix. he, she, it; him, her, it
essë
he
essë (2) pron? "he" (and also "she, it"?), possible emphatic 3rd sg. emphatic pronoun, attested in the sentence essë úpa nas "he is dumb" (PE17:126)
-is
respective
-is ending for the plural form of an unidentified case, by some called "respective" or "short locative" (Plotz)
-më
suffix. abstract noun
-nyë
i am come
-n (2), also -nyë, pronominal ending, 1st person sg. "I" (VT49:51), as in utúlien "I am come" (EO), cainen "I lay" (VT48:12-13), carin or carinyë "I do" (VT49:16), veryanen *"I married" (VT49:45). See also VT49:48. Long form -nye- with object ending -s "it" following in utúvienyes (see tuv-). A possible attestation of -n in object position ("me") is provided by the untranslated verbal form tankassen (PE17:76), where -n may be preceded by -sse- as a longer form of the 3rd person sg. ending -s (see -s #1).
-on
-on
-n (3) a plural sign used in some of the case endings (WJ:407): Pl. genitive -on, pl. ablative -llon (but also -llor), pl. locative -ssen.
-ro
he
-ro pronominal ending "he", in antaváro, q.v. In Tolkiens later Quenya, the ending -s covers both "he", "she" and "it".
-rë
suffix. abstract noun
-s
suffix. he, she, it
-ttë
they love themselves
-ttë (2), 3rd person pl. reflexive ending, as in melittë "they love themselves" (VT49:21). This ending can hardly coexist with #1 above; an alternative wording would be the analytical construction *meliltë intë. Compare -ssë #2.
insë
himself
insë "himself" and "herself", 3rd person sg. personal reflexive pronoun, apparently covering both genders, e.g. *tiris insë "(s)he watches him/herself" (but apparently the general reflexive pronoun immo may also be used, and it may even be preferable since the cluster ns seems unusual for Quenya). Compare insa, the corresponding impersonal form. Insë is derived from earlier imsë, a form that was possibly also used in Quenya (unless "imse" in Tolkien's manuscript is intended as an etymological form only, though it is not asterisked) (VT47:37)
númessier
they are in the west
númessier vb. "they are in the west", a construction occurring in Fíriel's Song, evidently núme(n)-ssë-ie-r "west-in-are-they"; the stative-verb suffix -ië is probably not valid in LotR-style Quenya (FS)
se
he, she, it
se (1) pron. "he, she, it" also object "him, her, it", 3rd person sg. Used "of living things including plants" (VT49:37; the corresponding inaimate pronoun is sa). The pronoun comes directly from se as the original stem-form (VT49:50). Stressed form sé, VT49:51, attested in object position in melin sé "I love him" (VT49:21). Ósë "with him/her", VT43:29; see ó-. Long dative/allative sena "[to/for] him" or "at him", VT49:14, allative senna "to him/her" (VT49:45, 46). Compare the reflexive pronoun insë *"himself, herself".
se
at, in
se (2), also long sé, preposition "at, in" (VT43:30; compare the "locative prefix" se- possibly occurring in an early "Qenya" text, VT27:25)
-ssë (3) possible longer form of the 3rd person ending -s; see -s #1. Such an ending probably could not coexist with -ssë #2 above. In one source, Tolkien first queried, then deleted this ending (VT49:49).