Kanji Analysis: 侶 (RYO / tomo)
Meaning:
The core meaning of the kanji 侶 is "companion," "partner," or "mate." It signifies a person who accompanies another, implying a close, shared journey or a deep, companionate bond.
Composition:
Radical: 亻 (にんべん, ninben) - The "person" radical on the left. This immediately places the character's meaning in the realm of people and relationships.
Phonetic Component: 吕 (RYO) - This component provides the sound ("ryo"). Its own meaning relates to a spine or backbone, and in this context, it can poetically contribute the idea of a "supportive backbone" in a relationship.
The combination creates an image of a person who is a supportive companion, someone who stands with you.

Common Usages and Examples
This kanji is used in words denoting close, often romantic or spiritual, partnerships.
Common Compound Words:
伴侶 (hanryo): Partner, spouse, life companion. (This is the most profound and common word, especially for a life partner).
情侶 (jōryo): Lovers, a couple in love.
侶 (tomo): Companion, mate (a more literary or poetic standalone usage).
Example Sentences:
彼は生涯の伴侶を見つけた。
(Kare wa shōgai no hanryo o mitsuketa.)
"He found his life partner."あのカップルは幸せな情侶だ。
(Ano kappuru wa shiawasena jōryo da.)
"That couple are happy lovers."旅の侶として、お互いを支え合った。
(Tabi no tomo toshite, otagai o sasaeatta.)
"As companions on a journey, we supported each other."
"侶" as a Tattoo: Meanings and Cautions
As a tattoo, "侶" is an excellent, profound, and deeply positive choice for symbolizing a committed partnership.
Potential Positive Tattoo Meanings:
A Declaration of a Lifelong Partnership: This is the most powerful meaning. It is a perfect symbol for a couple to represent their bond as life companions (伴侶). It goes beyond fleeting romance, emphasizing commitment, shared destiny, and mutual support.
The Value of Companionship: It can celebrate the importance of having a true partner in life—someone who is your equal and your support system. It signifies that the journey is shared.
A Tribute to a Specific Person: It can be a deeply personal way to honor a spouse, partner, or even a very close friend who has been a constant and vital companion on your life's path.
A Symbol of Unity in a Shared Endeavor: For two people starting a business or a major project together, it can symbolize their partnership and shared commitment to the venture.
Cautions and Considerations:
Overwhelmingly Paired Connotation: The character strongly implies a partner in relation to someone else. As a single character, it can feel incomplete, as its power comes from the connection it represents. It might lead to the question, "Who is your companion?"
Can Be Perceived as Impersonal in a Single Form: While the meaning is beautiful, the single character "侶" is somewhat formal and literary. The profound meaning is most clearly conveyed in the compound 伴侶.
Slightly Gendered Perception: Due to its use in words like 伴侶, it can be perceived as a neutral term for a partner. However, in the context of a tattoo, its meaning would be defined entirely by the wearer's intent.
Final Verdict and Recommendation
"侶" is a highly recommended tattoo choice for symbolizing a deep, committed, and companionate partnership.
Who might this tattoo be for?
A couple (as matching or complementary tattoos) to represent their lifelong bond.
Someone who wants to honor their spouse or partner.
An individual who believes in the power of partnership and wants a constant reminder of the person who shares their journey.
Recommendations:
Ideal for Couples' Tattoos: This is arguably one of the best kanji for a couples' tattoo. It represents a deep, supportive, and equal partnership, making it a powerful shared symbol.
Consider the Compound Word: For absolute clarity and maximum impact, the word 伴侶 (Hanryo), meaning "life partner," is an exceptional tattoo choice for a committed couple.
Comparison to Other Kanji: It is more specific and profound than 友 (tomo - friend). While 友 means "friend," 侶 implies a deeper, more intimate, and often lifelong partnership. It is less common but more focused on companionship than 愛 (ai - love), which is a broader term for love.
In summary:
If you are looking for a kanji that represents the beauty of a shared journey, the strength of a lifelong partnership, and the profound bond of being true companions, "侶" is an elegant, meaningful, and highly recommended choice. It is a tattoo that celebrates connection, commitment, and the person who walks beside you in life.