These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Whale Rider
Mary Sue: Paikea is one, but she's an example of the trope done well.
Tear Jerker: Paikea's speech, the beached whales, Paikea proclaiming that she's "not afraid to die", basically the last half hour of the film.