8 Books Where Unlikely Friendships Become the Best Part of the Story

Some books draw you in with an impossible mission, a strange creature, or a mystery. Then two characters start looking out for each other, and suddenly their next conversation matters as much as the plot.

The most satisfying unlikely friendships have friction. The characters disagree, misunderstand each other, and bring different ideas about how to live. Their connection becomes convincing through small decisions: listening, showing up, or staying when leaving would be easier.

These eight books make that growing trust a reason to keep reading. The selection spans science fiction, fantasy, historical fiction, and quieter contemporary stories, with each offering a different kind of companionship.

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1. Dungeon Crawler Carl by Matt Dinniman

A man and his ex-girlfriend’s cat might sound like the setup for a short joke. Matt Dinniman turns that pairing into the foundation of an outrageous survival adventure.

After Earth’s destruction, Carl and Princess Donut enter a deadly dungeon built around an intergalactic entertainment system. Donut gains the ability to talk, and her opinions quickly become everybody’s problem.

Their appeal comes from the balance between irritation and loyalty. Carl has practical worries about staying alive. Donut has strong feelings about her dignity. Neither gets to remain simply the responsible human or the entertaining animal companion.

The friendship gives the spectacle consequences. A dangerous encounter matters more when survival means keeping this particular, infuriating companion beside you.

Best for: Readers who want sharp banter, growing loyalty, and an action-heavy series. Expect graphic violence and adult humor.

Read more: Why Dungeon Crawler Carl’s Friendships Matter as Much as Its Action.

Find your copy: Start Carl and Donut’s adventure with Dungeon Crawler Carl.

2. A Psalm for the Wild-Built by Becky Chambers

Sibling Dex serves tea and listens to other people’s troubles, but has difficulty understanding their own restlessness. Mosscap is a robot trying to understand what humans need.

Their meeting gives Becky Chambers room to explore a friendship built through curiosity. Dex and Mosscap do not share the same assumptions about purpose, work, or what makes a worthwhile life. That difference keeps their conversations interesting.

The pleasure here is having a companion who takes your questions seriously without insisting that you should already know the answers. Mosscap’s perspective lets familiar anxieties look a little less inevitable.

Choose this novella when you want a friendship with room for uncertainty, pauses, and changes of mind.

Best for: Readers seeking a short, gentle science-fiction story about purpose and companionship.

Find your copy: Spend time with Dex and Mosscap in A Psalm for the Wild-Built.

3. A Man Called Ove by Fredrik Backman

Ove likes rules, routines, and people who know how to do things properly. A young family moving into his neighborhood brings a considerable threat to all three.

His friendship with his neighbor Parvaneh works because she refuses to let his grumbling end every conversation. There are practical tasks to do, requests to make, and people who keep turning up.

Backman connects those interruptions to the grief beneath Ove’s anger. Being needed becomes complicated: it can feel intrusive, exhausting, and meaningful all at once.

The relationship is especially rewarding if you enjoy characters who express care through actions before they find words for it. Ove’s usefulness to others gradually opens a route back toward connection.

Best for: Readers who like prickly characters, neighborhood communities, and humor alongside grief. The novel includes suicide attempts.

Read more: Why A Man Called Ove Is a Must-Read Novel.

Find your copy: Meet Backman’s unforgettable neighbor in A Man Called Ove. [Amazon affiliate link: insert approved book link]

4. Remarkably Bright Creatures by Shelby Van Pelt

Tova Sullivan works nights at an aquarium, keeping busy after her husband’s death while carrying the unresolved loss of her son. One of the aquarium’s residents, a giant Pacific octopus named Marcellus, becomes an unexpected companion.

That premise is unusual enough to attract attention. The stronger reason to read is the connection between two beings whose lives are shaped by limitations other people barely notice.

Marcellus has a distinct personality and a watchful intelligence. Tova brings patience and a life that extends far beyond her job. Their encounters turn ordinary cleaning shifts into opportunities for recognition.

A mystery gives the novel direction, but the friendship makes its questions personal. Understanding someone’s sadness becomes a reason to act.

Best for: Readers who enjoy animal characters, community stories, and emotional mysteries involving grief.

Find your copy: Discover Tova and Marcellus’s connection in Remarkably Bright Creatures.

5. Project Hail Mary by Andy Weir

Ryland Grace wakes aboard a spacecraft with missing memories and a mission whose stakes are almost impossible to comprehend.

There is a friendship at the center of this novel that deserves to be discovered through the story, so the details can wait. What makes it belong here is the way cooperation becomes both a practical challenge and an emotional commitment.

Understanding someone requires effort. Trust has to develop through observation, communication, and repeated decisions to help. Weir makes those steps part of the adventure itself.

If you enjoy problem-solving fiction, that gives the book an extra attraction: the relationship grows through the work the characters do together. Scientific questions and personal attachment keep strengthening each other.

Best for: Readers who want a science-fiction adventure with technical puzzles, humor, and an emotionally important partnership.

Find your copy: Go into Project Hail Mary knowing as little as possible.

6. The Housekeeper and the Professor by Yoko Ogawa

Translated from the Japanese by Stephen Snyder.

A housekeeper begins working for a mathematics professor whose short-term memory lasts only eighty minutes. Her young son also becomes part of the professor’s world.

Their circumstances require introductions to happen again and again. Ogawa finds meaning in that repetition: care can have value even when the person receiving it cannot carry every shared experience into the following day.

Numbers and baseball give the characters ways to connect across differences in age, education, and experience. Understanding grows through things they can share in the present.

This is the quietest recommendation on the list, and a strong choice if you want attention and patience to matter as much as dramatic gestures.

Best for: Readers drawn to Japanese fiction, restrained storytelling, and relationships across generations.

Find your copy: Explore memory and companionship in The Housekeeper and the Professor.

7. The Golem and the Jinni by Helene Wecker

Chava is a golem made of clay. Ahmad is a jinni associated with fire. Both find themselves navigating immigrant New York in 1899, concealing identities that would make them difficult for their neighbors to understand.

Their contrasting natures give the relationship substance. Chava feels the needs of others intensely, while Ahmad struggles against restriction. They have very different relationships with responsibility and freedom.

That makes their connection useful as well as comforting. Each encounters someone capable of questioning habits that might otherwise go unchallenged.

Wecker’s blend of historical fiction and fantasy gives their friendship a setting full of other lives, obligations, and competing needs. There is romantic complexity here too; readers seeking an exclusively platonic story should bear that in mind.

Best for: Readers who enjoy historical fantasy, immigrant stories, and patient character development.

Find your copy: Enter Wecker’s richly imagined New York with The Golem and the Jinni.

8. City of Thieves by David Benioff

During the siege of Leningrad, Lev and Kolya are given a seemingly absurd task: find a dozen eggs for a Soviet colonel’s daughter’s wedding cake.

Failure could cost them their lives.

Lev’s uncertainty and Kolya’s confidence create an immediate mismatch. Their journey gives that difference room to develop through conversation, danger, and dependence on one another.

The friendship matters because it preserves individual personality within a setting defined by deprivation. Lev and Kolya can still irritate, amuse, and surprise each other when the circumstances around them are horrifying.

Choose this for the combination of an urgent mission and a relationship that gives the journey emotional weight. Its humor accompanies a brutal wartime setting.

Best for: Readers who want historical fiction with momentum, dark humor, and a mismatched pair at its center. Expect disturbing wartime violence and sexual content.

Find your copy: Follow Lev and Kolya’s desperate search in City of Thieves.

Which Friendship Should You Read About First?

For a gentle place to start, try A Psalm for the Wild-Built. For a longer adventure, choose Project Hail Mary or Dungeon Crawler Carl. If everyday acts of care interest you most, pick up A Man Called Ove or The Housekeeper and the Professor.

The common thread is the pleasure of watching someone become important to another person, often before either is ready to admit it.

Which unlikely fictional friendship has stayed with you? Share your favorite in the comments.

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