Basic Trope: A character who has a one-person sexual preference.
- Straight: Alice has only ever really been attracted to Bob. They've been on-and-off over time, and she once tried a rebound guy, but he didn't do it for her.
- Exaggerated:
- Bob becomes "Barbara" and Alice becomes even more attracted to Bob now that she's a woman.
- Alice is an Emotionless Girl with no interest in anything until the very mention of Bob comes up, then she starts to Squee over him.
- Alice converted her closet into a shrine dedicated to Bob with several pictures of him on the walls, which she uses during her... "alone time".
- Alice of Universe A and Alice of Universe B have been asexual for their entire adult lives, but, when their universes set up a stable portal network, they get married.
- Downplayed:
- Alice and Bob are High-School Sweethearts. Alice has been with him for pretty much her entire dating career, and so she's never really given other guys much thought.
- Alice has had other lovers than Bob, but they all have looked remarkably similar to Bob in one way or another.
- Justified:
- Alice and Bob have known each other since childhood and now that they're adults, she started to develop deeper feelings.
- Alice is a Butt-Monkey, mistreated by all men except for Bob, who she falls in love with because he was nice to her.
- Alice is in a time or society when women weren't as valued as they are in present-day Western societies, but Bob was one of the few men who shared Alice's feminist views and encouraged her to pursue her career.
- Alice and Bob are the only people left on Earth.
- Alice is demisexual and Bob is the first man she's formed an emotional connection with.
- Inverted: Alice is attracted to every man she meets except for Bob.
- Subverted:
- Alice is attracted to Bob, and has been with him for a long time, but admittedly finds other men attractive.
- During one of their "off" phases, Alice keeps talking about her beloved online friend, Rob, and decides to meet him in person and see where it goes.
- Double Subverted:
- The other men either resemble Bob or have some aspect, like a hobby, that reminds her of Bob.
- "Rob" turns out to be Bob's online persona.
- Parodied:
- Turns out "Bob" is Alice's imaginary friend.
- Should Bob change anything in his regular persona, Alice's love for him will suddenly vanish completely, with her stating "You're not the Bob I fell in love with!" or even "You're not Bob! What have you done with my love!?"
- Zig-Zagged: Alice both claims that she is attracted to other people than Bob and that she was lying about said claim. The evidence given in-series never seems to hint at one way or the other, to the dismay of many.
- Averted:
- Alice is not attracted to Bob.
- Alice is attracted to Bob, but she's also attracted to plenty of other guys.
- Enforced: Alice and Bob are the two likable, attractive leads of the show, while everyone else is either bitchy, a Jerkass, or a Gonk.
- Lampshaded: "Has Alice ever had the hots for anyone besides Bob?"
- Invoked: Alice's friends play Shipper on Deck and see Bob as her ideal match, an assessment that Alice agrees with.
- Exploited: A shapeshifter kidnaps Bob and assumes his identity to get close to Alice and learn her secrets, weaknesses, as well as get her to sleep with him.
- Defied: She's not attracted to Bob because it's him... But because they share a Conveniently Common Kink of some sort. Alice realizes this and tries to meet others who share the kink.
- Discussed:Emily: Hey Alice, have you ever been attracted to... anyone else, really?
Alice: Yeah, of course I have. This Is Reality, not some kind of sappy One True Love TV-land.
or...
Alice: No, I've known he was the one since I was nine. - Conversed: "You know, this new show's hero... are you really straight if you've only ever liked one person?"
- Implied: Whether Alice is attracted to anyone else than Bob is never outright stated... But whenever one of them gets jealous, Bob is always shown as being jealous unnecessarily.
- Deconstructed:
- Because Bob is the only person she's attracted to, Alice sees Bob has her only chance for love. Not wanting to screw things up, she's willing to forgive him almost anything, which leads to an unhealthy relationship.
- Alice is attracted to Bob, but Bob isn't attracted to her, and so she lives alone because she won't take anyone else.
- Reconstructed:
- Alice comes to understand that Bob is the only person she'll ever be attracted to... but he's also an asshole. And that's OK. She still masturbates over him, but she stops trying to force their relationship to work, and settles down with her best friend and Heterosexual Life Partner Claire. Alice and Claire have a healthy relationship and make each other very happy even if they're not attracted to each other sexually.
- Alice is attracted to Bob, but Bob isn't attracted to her, and so Alice instead hooks up with Bob's twin brother/Identical Stranger, Rob, who is attracted to her. If neither of those options are available, she can still find someone who is, say, 80% Bob, and do her best to avoid Loving a Shadow.
- Played For Laughs: Alice's friends don't like Bob, so they try to set her up with dates. Said dates usually end in comedic disaster and Alice goes right back to Bob.
- Played For Drama: Bob dies, and Alice either goes into The Mourning After and never remarries, or is Driven to Suicide
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