Last time one had an idiosyncrasy

cliquecentrist
thaumaturgist
theatricalist
theogonist
calorimetrist
monotheist
violoncellist
celticist
elocutionist
seismologist
abiogenist
emblematist
tachygraphist
parodist
polemicist
catechist
cetologist
futurologist
chain hoist
fetichist
fetishist
feudalist
feuilletonist
bimetallist
fictionist
herbalist
arborist
prosaist
schist
textualist
Assyriologist
vineyardist
poltergeist
Teutonist
emotionalist
empiricist
encyclopedist
interventionist
vacationist

The Obrist.