close friend, bosom buddy / crony, chum

vassal, subject

(humble, historical or archaic) I, me; your servant (humble pronoun, especially when speaking to a monarch)

vassal, subject

(historical) the sixth-highest of the 八色の姓 (Yakusa no Kabane, “eight hereditary titles promulgated by Emperor Tenmu”)

loyal subject / vassal / retainer

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness

(formal) first-person singular pronoun: I, me