
die Faser
fiber
A thin, thread-like structure that can be natural (e.g., in plants or muscles) or artificial (e.g., in textiles).
Der Pullover ist aus einer sehr weichen Faser gemacht.
The sweater is made from a very soft fiber.
fiber
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fiber
A thin, thread-like structure that can be natural (e.g., in plants or muscles) or artificial (e.g., in textiles).
Der Pullover ist aus einer sehr weichen Faser gemacht.
The sweater is made from a very soft fiber.

fiber
Figurative and usually in the plural: the inner strength, character, or moral substance of a person.
Er hasste die Ungerechtigkeit mit jeder Faser seines Wesens.
He hated injustice with every fiber of his being.
'Faser' (fiber) is a common component of compound nouns. Examples such as 'Glasfaser' (glass fiber/fiber optic), 'Muskelfaser' (muscle fiber), or 'Naturfaser' (natural fiber) show that it can refer to different kinds of thread-like structures.
Für schnelles Internet wird heute oft ein Glasfaserkabel verlegt.
For fast internet, fiber-optic cable is often laid today.
In the literal sense, 'Faser' (fiber) is often combined with adjectives that describe the material. Common combinations are 'natürliche Fasern' (natural fibers), 'synthetische Fasern' (synthetic fibers), or 'feine Fasern' (fine fibers).
Leinen besteht aus natürlichen Fasern und ist im Sommer sehr angenehm zu tragen.
Linen consists of natural fibers and is very comfortable to wear in summer.
The figurative meaning is almost always used in the fixed expression 'mit jeder Faser' (with every fiber) or 'mit allen Fasern' (with all fibers). It expresses that someone feels or does something with their whole being and very intensely.
Sie ist mit jeder Faser ihres Körpers eine Kämpferin.
She is a fighter with every fiber of her body.
character
Both words can describe a person's moral substance. Charakter is the normal direct term for this, while Faser usually carries this meaning only in the plural and in a figurative expression. Therefore, normally use Charakter, for example in „menschliche Stärke und Charakter“; Fasern fits in established metaphorical expressions.

Auch unter Druck bewies sie in jeder Faser ihres Wesens große Ehrlichkeit.
Even under pressure, she showed great honesty in every fiber of her being.
Sein Charakter zeigt sich daran, dass er auch unter Druck ehrlich bleibt.
His character is revealed by the fact that he remains honest even under pressure.