apostate
bitter-ender
brawler
defendant
demurrer
diehard
disputant
dissenter
dissentient
dissident
intransigent
irreconcilable
last-ditcher
litigant
naysayer
negativist
nonconformist
noncooperator
objector
obstructionist
obstructive
opinionist
opposer
opposition voice
oppositionist
plaintiff
protestant
quarreler
recusant
resister
schismatic
scrapper
sectarian
sectary
separatist
wrangler
demonstrator
activist
attackers
cameraman
campaigner
commentator
extremist
journalist
protestors
refugee
rioter
villager