As a complex dynamic system, the brain remains notably active even at rest. Yet, the behavioral significance of such spontaneous activity is largely uncharted. We hypothesize that the variations in human behavior between individuals are embedded within the intricate patterns of intrinsic dynamics — an aspect previously underestimated but meriting integrative examination. Through resting-state functional MRI data, we extracted over 1 million spatiotemporal dynamic features, which encompass 7,700 temporal indices distributed across 271 brain regions for each individual. We introduced a comprehensive framework to thoroughly investigate the intricate spatiotemporal dynamics of the brain and their inherent associations with diverse human behaviors, integrating various analytical techniques. Our findings illuminate a novel set of dynamic properties that capture the distinctive 'fingerprint' of an individual and elucidate individual differences across cognitive and externalized behavioral dimensions. Interestingly, these dimensional brain signatures can be generalized and correlated with age-specific behaviors in an independent adolescent population. Our study sheds light on how intrinsic brain dynamics shape human behavior, offering a framework to understand behaviors and mental disorders through a complex systems lens.