I (first-person singular personal pronoun) / first-person singular prepositional pronoun; me

(chiefly philosophy) ego; self (individual person as the object of his own reflective consciousness)

Used to draw attention to oneself after having their name called.

a suffix for people used for some nationalities, philosophical visions, etc., e.g. ateu (“atheist”), egeu (“Aegean”), europeu (“European”), judeu (“Jewish”)

a noun-forming suffix of low productivity, corresponding especially to English learned words in -ee: apogeu (“apogee”), espondeu (“spondee”), jubileu (“jubilee”)

I have self-confidence

alter ego (alternate personality or persona)

(sarcastic) used to express frustration

(Brazil) An expression of indignation or disgust.

the person the pronoun I refers to in a literary piece with no named characters, not necessarily being the work's author themselves