Maecenas
abettor
acolyte
adjutant
admirer
advocate
aficionado
agent
aid
aide
aide-de-camp
aider
ally
alter ego
alternate
amicus curiae
angel
apologist
assistant
attendant
attorney
auxiliary
backer
backup
backup man
best man
bridemaiden
bridesmaid
bridesman
buff
champion
coadjutant
coadjutor
coadjutress
coadjutrix
defender
dependence
deputy
dummy
encourager
endorser
executive officer
exponent
fan
favorer
figurehead
friend at court
groomsman
help
helper