口癖【くちぐせ】
pet saying, favorite phrase, stock phrase, catchphrase, manner of talking
癖【くせ】
habit (usu. a bad one), tendency, peculiarity, idiosyncrasy, mannerism, quirk, crease, wrinkle, curl, kink
潔癖【けっぺき】
fastidiousness, love of cleanliness
性癖【せいへき】
disposition, inclination, characteristic, idiosyncrasy, propensity, sexual disposition, fetish