hi,
there's no specific role designated for the mgmt trainee.. it depends on the industry he's inducted into, it depends on the designation etc,
as an mba fresher you could have the opportunties to take up roles such as an HR generalist, recruiter,trainer, OD consultant etc...based on the area then you get to know what are your KRAs as well as the job responsibilities (competencies as well) one needs to perform effectively..
another trend seen these days is tht of a Functional consultant be it for SAP , oracle etc..
well if you are studying in one of the top premier institutes it would be easy to get into these job profiles..
otherwise one can start off as a recruiter(well most freshers do) n then move on as you explore the possibilities in other areas..
hope that answers..atleast to an extent..