acolyte
Synonym discussion
Sense: noun/1
Acolyte is more formal and less common than follower. It often suggests unusually strong loyalty to a leader, especially in politics, and it can sound slightly critical. Disciple is closer when the relationship is based on teaching or belief, while assistant simply means someone who helps with work and does not imply devotion. Attendant is useful for someone who serves or accompanies another person in a ceremony or formal setting. You might call a junior priest's helper an acolyte, but a receptionist or office assistant would not normally be one.
Etymology
Acolyte comes from a Greek word meaning a follower or attendant. It passed through Latin and later French before entering English, which helps explain why the modern word still suggests someone who goes with and supports another person.