How are the characters in harry potter and the philosopher`s stone and alice in wonderland presented as eccentric?

They are eccentric in Alice in Wonderland because they say strange things, either they look odd or what they say is nonsensical.

Similarly there are some characters in Harry Potter that behave in a rather offhand and aloof way, stating things in a way that one would not expect in normal conversation and thus being portrayed as eccentric as a result.

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