Maria is portrayed as ditzy most of the time, as well as snarky, a nymphomaniac and particularly spiteful and strained with Salvatore, although there's a significant differences in personality in Liberty City Stories and III, implying she has slightly mellowed over the years.

In Liberty City Stories she is shown to be immature, greedy, obnoxious, selfish and is secure about her looks, although she has no control over herself, using drugs (and at one point almost overdosing) and spending a lot.