- Professor Otto Lidenbrock: a hot-tempered geologist with radical ideas.
- Axel: Lidenbrock's nephew, a young student whose ideas are more cautious.
- Hans Bjelke: Icelandic eiderduck hunter who hires on as their guide; resourceful and imperturbable.
- Gräuben: Lidenbrock's goddaughter, with whom Axel is in love; from Vierlande (region southeast of Hamburg).
- Martha: Lidenbrock's housekeeper and cook.
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