ward assembly member; ward councillor
Refers to an elected member of a ward assembly, especially in municipal or Tokyo special-ward contexts. Although the older English gloss says 'assemblyman', the Japanese term is gender-neutral.
地元の区議に保育園の問題を相談した。
I consulted a local ward assembly member about the nursery school issue.
彼女
He was elected as a ward assembly member in last month's election.
She is active as a ward councillor in Setagaya Ward.
She has served as a ward assembly member for over ten years.
I heard my friend is going to run for ward assembly member next year.
区議 represents a ward-level assembly member, whereas 都議 represents a member of the Tokyo Metropolitan Assembly, a higher level of government.
区議 refers to an individual ward assembly member, while 区議会 refers to the ward assembly itself as an institution.
Used for people in formal or counting-by-seating contexts; this is the most natural choice from the given inventory.
A Sino-Japanese administrative term combining 区, 'ward', with 議 as used in legislative terms; it is understood as a shortened form of 区議会議員, 'ward assembly member'.