battler
belligerent
belted knight
bickerer
bitter-ender
blade
bravo
brawler
bully
bullyboy
combatant
competitor
contender
contestant
defendant
diehard
disputant
dissentient
dissident
duelist
enforcer
fencer
feuder
fighter
fighting cock
foilsman
gamecock
gladiator
goon
gorilla
hatchet man
hood
hoodlum
hooligan
intransigent
irreconcilable
jouster
knight
last-ditcher
litigant
militant
naysayer
negativist
noncooperator
objector
obstructionist
obstructive
opposer
oppositionist
plaintiff
controversialist
eristic