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".
Quenya
-ssë
suffix. himself, *herself, itself
insë
pronoun. himself, herself
insë
himself
immoquanta
adjective. full of him/herself, egotistic, narcissistic
se
he, she, it
immo
same one, self
immo, "same one, self" (VT49:33), general singular reflexive pronoun (covering both the 1st, 2nd, and 3rd person sg.), except where the subject is impersonal, in which case imma is used instead (VT47:37). Hence *tirin immo* "I watch [my]self", tirilyë immo "you watch [your]self", tiris immo "(s)he watches [him/her]self" (but apparently tiris imma** "it watches [it]self").
-ro
he
-ro pronominal ending "he", in antaváro, q.v. In Tolkiens later Quenya, the ending -s covers both "he", "she" and "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)
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)