The voice of the fairy is quite tiring, because it is so high-pitched. The name is not very imaginative. This story just does not fit into the Bibi-universe. So far, Bibi has taken all kinds of magical creatures, but elves have never been there and do not want to also fit so right now.
Most disturbs me the inconsistency in the Hexsprüchen. Bibi conjures himself with "Eene meene wonderful, I'm going invisible" actually invisible. Exactly this spell she used in "The Witch Birthday" to invisible witch Karla and that's gone wrong, so just Karla's lower body invisible. The correct sentence is on the black side (which is bekommen- a new name in this episode of old now politically incorrect?) And says: "Eeene meene Adebar, xy will be visible" and then a triple "Hex Hex". If there are umpteen right Hexsprüche for any purpose, the witches have indeed no longer go to school, to the right spells to learners then one can easily rhyme everything and has a functioning spell found.