For someone with OLP, 7 might be a stern older man, J an eager young woman, and Thursday reliable but dull. The attributions are involuntary, detailed, and stable, and their owners are typically aware the personalities are perceptions rather than facts.
OLP tends to co-occur with other sequence-related forms such as spatial sequence synesthesia. Researchers read it as evidence that the synesthetic mechanism can bind not just sensory qualities like color but conceptual ones like personality, which is part of what motivates the broader idea of ideasthesia.