使い: -er; -ist; -ator; -mancer (user; manipulator; tamer)

使い魔: a familiar

item with utility / (usually prefixed as おつかいもの) present

errand

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

work; labor / achievement; ability; performance; talent / salary; earnings; income

messenger

(mythology, folklore, fantasy) a familiar spirit

using; usage; use; utilization / (folklore, fantasy) a charmer / a user / an envoy; a messenger

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