the.com/advocate
Someone who shows up to argue for you when you can't argue for yourself.
means A person who publicly supports, recommends, or pleads on behalf of a cause or another individual.
from From Latin advocatus, one called to aid — ad (to) plus vocare (to call), literally a voice summoned to your side.
Legal cousinIn Scotland and beyond, advocate means courtroom lawyer.
Devil's roleThe original devil's advocate argued against sainthood candidates.
Verb tooYou advocate for things, not merely become one.