The Michif system is closest to a neutral or accusative system.
Most object NPs are unmarked.
When there are two animate 3rd person NPs, one of them can be marked with a so-called obviative marker (-a, or -wa). This is the new or non-topic NP. It can be subject or object, but most often object.
Many sentences with two NPs have no obviative marker, however.
Source: Fleury 2007
Source: Fleury 2007
Source: Fleury 2007
Source: Fleury 2007