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  • Crowning Moment of Heartwarming: So many that you'd think the entire story would Taste Like Diabetes, but it somehow manages to avoid this.
  • Germans Love David Hasselhoff: Heidi is a classic in the German-language sphere as well as the world, but it is notably popular in Japan and Turkey.
  • Glurge: Enjoyable Glurge, but still.
  • Purity Sue: Heidi. Klara, to an extent.
    • But apparently not Purity Sue enough for Fraulein Rottenmeier. It's hinted that Rottenmeier has been reading books featuring Swiss girls that were even bigger Sues than Heidi ("I thought I would look for a little Swiss girl, as I hoped to find such a one as I have often read about, who, born as it were of the mountain air, lives and moves without touching the earth") and is disappointed that Heidi doesn't live up to this impossible standard.
    • Fair for Its Day: Heidi and Klara are characters from a novel written in 1880, for readers of that time frame. So they're Purity Sues by today's standards, but not for the time they were written.
  • Mainstream Obscurity: One TV movie became known to a lot of people only because a broadcast of it once pre-empted an extremely tense NFL game.
  • Nightmare Fuel: So, so much in many of the adaptations. Fraulein Rottenmeier is one of the Egregious examples of this in a few of the cartoon versions, but especially in the Hanna Babera film "Heidi's Song." There's one part where she turns into a fanged witch and...well, you should really just watch it for yourself. Or don't, if you'd like to sleep again.
  • Tear Jerker: Come on, try not to go for the hankie when Klara finally leaves her wheelchair.
    • Or Heidi's Heroic BSOD that leads her to become a sleepwalker because she cannot stand being away from home.
  • Unfortunate Implications - The Hottentots, anyone?
  • Values Dissonance: It's strongly implied that Heidi's sleepwalking spells are caused by a propensity to epilepsy - her mother had seizures ("curious attacks, during which no one knew whether she was awake or sleeping"), and at the time the book was written epilepsy was thought to be inherited.