Rin's death in terms of forwarding the plot (as in, Naruto's plot existance in the first place)
Hiruzen's death in terms of character arcs development (Naruto, Jiraiya, Orochimaru, Danzo, etc)
Zabuza and Haku's death in terms of personal preference (Zabuza was a badess and went out like a badess)
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Always gets me