* GermansLoveDavidHasselhoff: ''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.
* PuritySue: Heidi. Klara, to an extent.
** But apparently not PuritySue enough for Fraulein Rottenmeier. It's hinted that [[WrongGenreSavvy 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.
** FairForItsDay: 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.
* MainstreamObscurity: One TV movie became known to a lot of people only because a broadcast of it [[http://en.wikipedia.org/wiki/Heidi_Game pre-empted an extremely tense AFL]][[note]]"American Football League"; now part of the NFL[[/note]] [[http://en.wikipedia.org/wiki/Heidi_Game game]].
* NightmareFuel: 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 Creator/HannaBarbera film "Heidi's Song."[[note]]One of only three movies they ever made that didn't feature their trademark characters (the others being Literature/Charlotte's Web, and Film/OnceUponAForest.[[/note]] 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.
* ObfuscatingDisability: The 1993 adaptation heavily implies that in addition to being paralyzed, Klara is an asthmatic. Her asthma attacks start off as real, but there is evidence that she uses them to keep Heidi from talking about leaving or trying to leave.
* TearJerker: Come on, try not to go for the hankie when Klara finally leaves her wheelchair.
** Or Heidi's HeroicBSOD that [[spoiler:leads her to become a sleepwalker because she cannot stand being away from home]].
** To a lesser extent but still applies, when it is hinted at Alm-uncle's backstory that he left the army not for a murder, as often rumoured, but for the death by illness of an officer he had under his care as a male nurse sort of way, and said death was the beginning of his breakdown. Consider now that the first time the readers have access to those memories is by association with Klara, and that by helping her recover, he appears to be paying tribute to a man he admired and could not help, and...
* UnfortunateImplications - The Hottentots, anyone?
* ValuesDissonance: It's strongly implied that Heidi's sleepwalking spells are caused by a propensity to epilepsy - her MissingMom Adelheid 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.
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