a thing for
affinity
an ear for
an eye for
animus
aptitude
aptness
bent
bias
capacity for
cast
character
conatus
conduciveness
constitution
delight
diathesis
disposition
eagerness
eccentricity
fancy
fascination
favor
feeling for
felicity
flair
genius for
gift for
grain
idiosyncrasy
inclination
inclining
individualism
innate aptitude
kidney
leaning
liability
liking
make
makeup
mental set
mettle
mind
mind-set
mold
mutual affinity
tendency
propense
antipathy
appetite
fondness
infatuation
malady
obstinacy
penchant
perversion
predilection
predisposition
preference
proclivity
reluctance
repugnance
restlessness
shyness
trait
urge
density
intensity