Hi,
The notion of identity is probably the most widely addressed and complex issue of the film. Consider each character's search for acceptance (whether by the school, peers, parents, etc.) You could also consider the contrast between individual and group identity, and societal expectations (e.g. Todd's initial compliance with Nolan's request, and his eventual rebellion). You could consider the relationships the characters have with each other, the lack of meaningful connections to the school environment, the rejection of values of strict discipline and tradition, etc. Relevant to the rubric, you could consider the potential of an individual to enrich or challenge a group/community (i.e. Keating). You could also consider how different characters perceive 'belonging' differently (Todd vs. Cameron; Neil vs. his parents, etc.), or how their attitudes change over time.
Kind regards,
Delta Education