This paper investigates variation in the subject pronoun expression (SPE) in Papiá Kristang (Malacca Creole Portuguese), a language without verb inflection. Previous accounts of Kristang (Baxter, 1988, 2012b; Hancock, 1969, 1973; Knowlton, 1964; Rêgo, 1942) present the language as predominantly displaying overt subject pronouns. However, the overall null subject pronoun rate in the oral corpus contemplated is substantial, registering a frequency of 45.7% (input pr. 0.32). As such, the paper focusses on the distribution of null subject pronouns and the constraints directing that distribution. The study considers the effects of priming, structural location, verb semantic class, and tense-mood-aspect (TMA), and addresses the effect of the individual speaker. It is found that while null subject pronoun use in Papiá Kristang resembles, with minor differences, many attributes of this mechanism in other languages, it displays one notable trait: TMA particles favor null subject pronoun use. Extralinguistic constraints on SPE within the Papiá Kristang speech community are seen to concern more the characteristics of individual speakers, and clusters of individuals, rather than predictors based on a pan-community age and gender classification.