Same word as quirkinesses:

aberration, abnormality, anomaly, caprice, capriciousness, foible, freakishness, hereticism, idiocrasy, idiosyncrasy, irregularity, kink, nonconformity, oddity, oddness, outlandishness, peculiarity, queerness, quirk, singularity, strangeness, unconventionality, unorthodoxness, waywardness, weirdness, whimsicality, whimsicalness