fence-sitter
intransigentist
inactivist
Buridan's ass
sheeple
no changer
neutral
nonchooser
noncritic
accommodationist
fence sitter
justifier
apologist
nonaggressor
vindicator
Switzerland
non-responder
nonpartizan
phony
unmurmuring
nonpartisan
suppressionist
unsentimentalist
acquiescent
pretender
white knight
jangler
exclusionist
honey badger
nondissident
squawker
wrangler
nonadherent
nonconspirator
polemicist
oppositionist
anythingarian
not that there's anything wrong with that
preventionist
leveller
abstentionist
nonacquiescing
perhapser
postulator
caviler
inactive
adversary
pettifogger
noncontentious
opposer