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I have a confession. I rhonk about what would change if Caleb were a didi and not a gege because it causes a lot more drama and also gives us more of an underdog love interest vibe. Too many cool and accomplished men in the lineup, make him even more of a loser. Even if it's just a month younger or a year, the dynamic of him wanting/needing to be her protector becomes more complicated and heartbreaking, especially if she is just as protective of him.

I haven't been able to stop thinking about this ever since I got your ask anon. It affected me answering my asks, honestly. I got put in the ADHD dysfunction jail until I answered this one.

Being older gives gege structure. Authority. The quiet dignity of someone who’s always one step ahead, always holding the umbrella before the storm hits. But make Caleb a didi, and everything is upside down. The gravity aspect of him is about reaching now. The protector standing steady in the rain becomes the boy chasing after your shadow, sprinting to catch up, hoping that growing taller will make him feel older, stronger, enough. His love goes beyond being a promise of safety, and becomes a question he’s terrified to ask:

"What do I have to do for you to see me the way I see you?"

Let's talk about it.

In both Chinese and Japanese media, sibling terminology is never just familial, it’s loaded with hierarchy. “Gege” and “Nii-san” come with gravitas and respect. They mean: I go first. I carry the weight. The older brother archetype comes with authority by proximity. It places him above you. He was there first. He knew you first. He sheltered you when you were small and scared.

But “didi” (弟弟 / otouto) is a different creature entirely. He’s the one you stood in front of at the doctor’s office so he wouldn’t see the needle. The one who trailed you at school with scraped knees and untied shoes, clutching whatever you told him was important. He was the excuse you gave when you lied, the person you protected your entire life because you had nobody but him. He isn't the shield like gege is. He's the reason you needed to be one. Didi Caleb is not being relied on.

He's the one being taken care of in this scenario.

And yet, the moment you tell me that this version of Caleb is trying to be your protector anyway, it gets so juicy because this means more instability. That he's trying to reverse the roles so desperately.

Let's start with the physical aspect of it. There’s something unspoken about height in this kind of dynamic. Caleb is canonically 188cm, built like a hero. It's be more interesting if didi Caleb still has his original self's appearance. So now picture this: this beefcake towers over you. He can lift you with one arm. He blocks out the sun when he steps forward.

But every time you tilt your head to look up at him, he remembers a time when he used to tilt his head up at you and got his hair ruffled. He used to be the one enveloped in your arms. You used to be so big to him back then, his immovable mountain. But how small you are now, compared to him, but still able to make him feel so small.

That physical reversal is humiliating, in that sense. Because no matter how much taller he gets, part of him is still that boy — the one you once held, and still treats as such.

It disrupts Caleb’s clean, golden-boy narrative and turns him into something the story lacks — an underdog as you say. I know the word gets used in a scrappy comic-relief way nowadays, but I mean in the most emotionally bruising sense of the word.

Canon Caleb, as gege, is tragic and noble. His story is about sacrifice and distance and crossing lines and rewriting what they were to each other and the yearning and all those complicated stuff, about smiling while holding the knife by the blade, showing that he has been harboring a different person inside and he can't be the Caleb he's carefully curated for you anymore.

But as a didi, his tragedy becomes internalized in an entirely different register.

“I don’t want to be protected by you anymore. I want to stand in front of you now — and not because I’m strong enough… but because I love you. Look at me. See me as more. I've become so much more.”

It turns his competence into a coping mechanism. His strength becomes the performance. His medals, his rank, his years in the DAA — they're desperate proof. Proof that he’s no longer a kid. Proof that he's grown into someone you might look at differently. I can imagine that he still has the househusband skills of gege Caleb, but he's picked them up so you would would depend on him entirely.

And he knows it still isn’t enough.

He knows you see him. But not like that.

You still look at him with those warm, older-sister eyes. Still cups his cheek when he’s hurt like you used to when he was twelve. Still praises him with that gentle, knowing tone—“You’ve come so far.”

And it kills him. Because he doesn’t want to be commended. He wants to be chosen.

In canon, Caleb protects the MC because he always has. It’s natural. It’s part of their shared history.

But here? He’s trying to rewrite their roles. He’s fighting upstream against the current of every time you picked him up when he fell, every time you handed him the bigger slice, every time you stepped between him and something frightening.

So what does he do?

He overcompensates. Trains until his hands bleed. Takes on impossible missions. Volunteers for frontline danger. Tries to stack achievement on top of achievement like he’s building a ladder out of childhood.

But the heartbreak is that you never asked him to. You never demanded he become your shield.

Because you never stopped seeing him as someone you needed to guard.

Colonel Caleb with this context is more jarring. When he comes back hardened and unrecognizable in the Farspace Fleet uniform, it’s still a seismic moment. The same explosion. The same presumed death. The same return from the grave, standing across from you with a stranger’s voice and a soldier’s posture.

But as a didi, that moment is like realizing the kid you once put band-aids on has grown into someone you can’t read anymore.

Again, it’s the same reunion scene. Though he emotional footing is different now.

He’s returning as someone who outgrew you while you weren't looking. And you don't know what to do with that.

Because with gege Caleb, the rupture is spiritual. He returns changed, yes, but still playing the role you remember, gentle, playful, achingly loyal. He acts the same after they skip past the interrogation.

But with didi Caleb, the rupture is personal. It feels like a betrayal you don't have the words for. Didi Caleb's personality shift adopts the Colonel more and hangs onto the title and the authority that comes from it because that's exactly what he's been looking for all his life. He doesn't "drop it" like gege Caleb does around you.

From your perspective, he grew into someone who doesn’t need you anymore. Who might never have. And that realization burns more than his absence ever did.

There’s a dissonance between who you see and who you remember. The sense of not recognizing Caleb is stronger with the didi version of him precisely because he took that opportunity to assert he's not the younger brother and he doesn't intend to reassume that role. You aren't sure if it’s safe to speak to him the way you used to. If you're allowed to be the way you used to be with him. He’s bulkier now. His shoulders broader. His jaw is set differently when he’s thinking. And he watches you with an intensity that makes your skin prickle, because it’s not the wide-eyed look of a little brother hoping for approval.

He doesn’t want your grief. He doesn’t want your relief. He wants recognition. He wants permission.

You’re responsible for Caleb. That hasn’t changed, not in your bones. It doesn’t matter how old he gets or what rank sits on his chest — you raised that boy in the ways that counted. You taught him to keep his laces double-knotted and to stop lying with his face. You were the one who pulled him through his clumsy years and every heartache he couldn’t name.

And now you’re standing in front of him again after mourning him for an entire year and he’s acting like you’re the one who needs handling.

Yes, your check-ins became less frequent after he was cleared for flight. Yes, you didn’t exactly love the whole “don’t treat me like a kid” phase.

But you're not sure if this is a phase. It's as if he’s managed to get so good at keeping you out that he can now do it with a smile. And the part that drives you completely insane is that he’s become too clever to be caught.

He withholds now instead of lying, that's a technique he's mastered. Redirection. Dissolving arguments with jokes. When you press him, he grins and says something like, “You’re worrying too much again, Jie/Nee-san. You always do.”

And maybe that’s what stings the most. That somewhere along the way, he learned how to disarm you, to dodge the questions that matter. Weaponized taking cover behind the version of himself you still remember fondly while keeping everything that actually hurts buried six layers beneath the surface.

You want to scold him. You want to make him sit down and explain what the hell happened to turn him into someone who treats your concern like static in his comms. But you can’t. Because he’s too smooth with it. So cheeky, in that maddening way he gets when he knows he’s winning a fight you weren’t even sure had started.

You can't even compute as he shuts you in his house while smiling through it all like he doesn't have you under lock and key. Who has this kid become? Where have you gone wrong with him? It's this place, the Fleet. They must have done something to him, you're sure. You have to take him away from here, this can't go on. Your Caleb wouldn't even dream of doing something like this.

So when he corners you on that couch and tells you he's not playing house anymore and is certainly not going to keep being your younger brother, it's solidified that this is a clone that must have taken his place. Even after you leave Skyhaven in the aftermath of that disaster of an investigation, a part of you believes that ridiculous notion. There is no way your heart would be racing for your didi.

And the subsequent cards and memories that unfold have no hesitancy and the quiet yearning of gege Caleb who was benefiting from the status quo and being your protector despite having a love-hate relationship with the restrictions. Didi is assertive to establish that he's a man and that he wants OUT of that zone, he doesn't want to be regarded as a younger brother and hates being treated as such.

God, I yapped SO MUCH. This AU fascinates me, thank you for sharing it with me and allowing me to talk about it anon!

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