The pronouns of the first person singular and plural, m and no, are used for subject and object functions; the second person singular and plural subject pronouns bô and êthê 'you' both have a short form ô and thê; as object pronouns, only these short forms are used.
In the case of the third person singular pronoun, only ê can be used as a subject pronoun, but as an object pronoun, ê, e and le are used (for the rules determining which allomorph has to be used, see Maurer 1995: 90).
As for the third person plural pronoun, the variants ane and ene are used for subject functions; for object function, these two forms may be used, plus the short form ne.
In other words, there can be nominative-accusative marking in some cases, but it is not always obligatory.
Source: Maurer 1995: 183