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Kanji for Strength
The kanji most commonly used for "Strength" are 力、強、剛.
力
Kanji that mean Strength
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力
power, to exert, effort
Onyomi: rii, riki, ryoku Kunyomi: chikara 2 strokes Jōyō
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強
strong, powerful
Also associated with fearsome.
Onyomi: goh, kyoh Kunyomi: kowa.i, shii.ru, tsuyo.i, tsuyo.meru, tsuyomaru 11 strokes Jōyō
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剛
sturdy, rigid
Also associated with hard.
Onyomi: goh 10 strokes Jōyō
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健
healthy, strong
Also associated with skilled.
Onyomi: ken Kunyomi: suko.yaka 11 strokes Jōyō
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猛
fierce, wild, intense
Onyomi: moh 11 strokes Jōyō
力 is strength itself — physical force, power, the raw capacity to act. It is the simplest and most direct choice, two strokes, and appears in 力士 (sumo wrestler) and 努力 (effort).
強 is strength as a property: being strong, robust, resistant. Where 力 is the force, 強 is the state of having it. 剛 is hardness and unyielding firmness, closer to “steel” than “muscle”, and 健 is strength as soundness and health.
If you mean strength of character rather than of body, 剛 or 毅 read closer to resolve; 力 alone will be understood as physical.
Before you use Strength kanji
力 is unambiguous and reads as physical power. If you mean inner strength or resilience, 力 alone will not carry that — 剛 (unyielding) or a two-character word such as 剛毅 says it more precisely.