nutburger
crazyhead
have bats in one's belfry
wackadoodle
mad hatter
crackbrain
ding-a-ling
fruitcake
wingnut
nutbar
nutcase
kook
tapped
crackpot
whacko
nutter
wacko
mad as a cut snake
nutbag
have a screw loose
idiosyncratic
quizzical
odd bod
freako
eccentrize
dotty
off the deep end
glaik
space case
way out
strange person
crazo
spook
screw loose
creep
weirdie
oddball
balmy
weirdo
weirdy
live one
wackaloon
full deckism
oddling
cooked
spacy
doolally
zonky
eccentrical
squirrelly
superfreak
wack
kooky
eccentrically
freak
fruitloop
loon
rocket
weirdar
crazyitis
eccentricity
queer bird
stunod
odd fellow
wifty
queer duck
odd fish
flip one's wig
odd man out
asshead
arsehead
nutzoid
crazy
throw one's cap over the windmill
oddment
tonto
batshit
loony tune
5150
nutbaggery
loony
dingbat
cuckooness
nut job
muppet
headbanger
idiosomic
clown shoe
one's elevator doesn't go all the way to the top
oddballish
insane