First, principled but not preachy — the 1w9 leads by example rather than lecture. Second, deeply thoughtful and often philosophical, drawn to systems of meaning (ethics, theology, science) that provide frameworks for rightness. Third, more introverted than 1w2, preferring to work alone or in small groups where standards can be maintained without conflict. Fourth, prone to quiet perfectionism that others may not see until the 1w9 suddenly withdraws or becomes rigid. Fifth, values simplicity and order — their physical and mental spaces tend toward minimalism because clutter feels like chaos.