He is
bluto
a head case
beeper (bipolar)
schizo
mentally interesting
psych case
nutbag
cuckoo clock
off my rocker
psycho
loony
nuts
crazy
bats
bojangle
bonkers
buggy
buggingcock-eyed
crackpot
crunk
duck soup
tetched
dippy
flipped out
jumped the couch
lunachick
lunched
nerts
potty
shell
wig out
wiggity-wack
nutjob
certifiable
squirrelly
manic
unhinged
wing nut
'flicted
mentally challenged
disturbed
screw loose
spastic
split personality
nutcase
nutter
halfwit
mental
demented
weird
Freak
bimbo
strange
bonkers
brain damage
oddball
brain dead
out of it
thick
head banging
head case
crackers
idiot
Did I leave any out?