Papiamentu pronouns are invariant for case with two exceptions: Curaçaoan Papiamentu has bu as 2SG object of V (Compare bo 2SG subject form and bo as 2SG object of P. Aruban Papiamentu uses bo throughout), and the 3SG possessive pronoun takes the form su (Compare e as subject or object pronoun).
Source: Birmingham 1970: 66
Source: Römer 1983: 89