曲者

くせもの

noun

ruffian, villain, knave, thief, suspicious fellow

peculiar person, idiosyncratic person, stubborn fellow

tricky thing, something that is more than it seems

expert, master, highly skilled person

goblin, apparition, monster, ghost, phantom, spectre, specter

曲	bend, music, melody, composition, pleasure, injustice, fault, curve, crooked, perverse, lean
者	someone, person
癖	mannerism, habit, vice, trait, fault, kink
物	thing, object, matter