Cat and Mouse Games / Ada Wong x Sibling! Gender Neutral Reader
Which I give you, the reader, headcanons about being Ada Wong’s sibling.
Word count: 2360
A/n: This was requested by an anon. Enjoy it!
— How is their dynamic as siblings? —
Y/n and Ada share a complicated but unbreakable bond. She’s protective in her own way, though she rarely shows it outright. Instead of sentimental words, she expresses care through subtle gestures—slipping extra ammo into Y/n’s bag, ensuring they have an escape route, or dropping cryptic messages warning them of danger.
Ada keeps Y/n at a distance emotionally, but there’s a silent understanding between them. She believes that staying away keeps them safe, though deep down, she hates not being able to fully let her guard down around Y/n.
She’ll act like she doesn’t care if Y/n gets themselves into trouble but always shows up at the last second to bail them out. “Tsk, I told you not to get involved… Now let’s get out of here.”
If Y/n’s trained, Ada makes sure they’re just as elusive as she is—quick, efficient, and never lingering too long in one place. She might tease Y/n about their skills, but if anyone else dares to underestimate her sibling, she’ll shut them down with a sharp glare.
If Y/n’s not a fighter, she ensures they know how to escape and defend themselves. Ada is a firm believer in survival over confrontation, so she teaches them the best ways to disappear when things get messy.
— Do they have a very affectionate relationship with each other? —
No.
Ada rarely shows open affection, but when she does, it’s through small, almost imperceptible touches—fixing Y/n’s collar, handing them a medkit without a word, or giving them a rare smirk when they pull off something impressive.
If anyone dares to use Y/n against her, they’ve just signed their death warrant. Ada doesn’t take threats to her sibling lightly, and she’ll eliminate them swiftly and efficiently—no negotiations, no second chances.
She’d rather keep Y/n out of her world, but if they insist on being involved, she at least makes sure they know what they’re getting into. “If you’re going to be reckless, at least be smart about it.”
— How was their relationship growing up? —
Y/n and Ada didn’t have a traditional upbringing. Whatever their past was, Ada never talks about it, and Y/n learned not to ask.
If she’s the older sibling, she took on a protective role early on, making sure Y/n didn’t go without—even if it meant doing things she won’t talk about. If Y/n’s the older sibling, they might have tried to shield her from the path she eventually took, but Ada has always been good at slipping away.
Unlike Ada, who keeps her emotions in check, Y/n might express frustration at her disappearances. “Do you even care that I haven’t seen you in months?” Ada never answers directly, but the next time she leaves, she makes sure to send them a cryptic but meaningful message: Stay safe.
If Y/n’s her twin, people often compare them, but Ada is quick to correct anyone who assumes they’re just like her. “We’re not the same,” she’ll say—sometimes with pride, sometimes with an edge of regret.
Ada won’t openly admit she worries about Y/n, but she has eyes everywhere. If they’re in danger, she finds out before them even realize how bad things are.
If Y/n ever gets hurt, she masks her concern with sharp remarks. “You’re smarter than this. Don’t make me come save you again.” But if they’re unconscious, she’s scarily quiet, her usual composed demeanor slipping for just a moment as she patches them up.
If Y/n’s involved in the same line of work, she critiques their technique but secretly takes pride in their skills. “Not bad. But next time, don’t leave an opening.”
If Y/n’s not in the business, she tries to keep them out of it at all costs. If they ever get dragged in, it’s because someone used them as leverage against Ada—a mistake they won’t live to regret.
— How others view their relationship as siblings?—
Leon is immediately suspicious of Y/n when he first meets them. “Did Ada send you?” If they’re anything like Ada, he doesn’t trust them at first. If Y/n’s different, he wonders how they’ve managed to stay close to her when she keeps everyone else at arm’s length.
If Y/n’s anything like Ada, Leon is so done with both of them. “Great, there’s two of you now.”
If they’re different from Ada—especially more open or trusting—Leon is both amused and fascinated by how the two siblings even get along.
If Y/n and Leon end up working together, Ada has mixed feelings. “Try not to let him drag you into his hero complex,” she teases, but there’s a slight edge in her voice.
— What are each other’s role in their life’s? —
Whether Y/n likes it or not, they’re one of the few people Ada lets into her world. They might not always agree with her choices, but Ada listens to them in a way she doesn’t with most people.
They’re one of the only people who can call her out without immediate consequences. “For someone who always has a plan, you sure do like making things up as you go.” Ada rolls her eyes, but she doesn’t argue.
Ada doesn’t do open affection, but if Y/n’s in trouble, they’ll find her by their side before they even have time to panic. “What, did you think I wouldn’t come?”
No matter how much distance she puts between them, Ada will always make sure Y/n’s safe—even if it means working in the shadows to ensure no one touches them.
Ada is the type of sibling who won’t hover or nag, but she’s always watching out for Y/n. If they get into a dangerous situation, they won’t even have to call her—she already knows.
Even if they try to hide things from her, she somehow finds out. “You really thought I wouldn’t notice? You’re getting sloppy.”
Ada never explicitly tells Y/n to be careful, but her actions say it for her. A spare weapon left where they’ll find it, an untraceable phone slipping into their bag, or a coded message only they can decipher.
If Y/n ever confronts her about how much she keeps from them, she just gives a knowing smirk. “You don’t need to know everything. Just trust me.”
Whether she’s Y/n’s older or younger sibling, Ada acts like the older one. She’s the one covering for them, making sure they don’t get too reckless, and keeping an eye on their choices.
If Y/n’s injured, expect her to treat them while making sarcastic remarks. “You’re lucky I got here in time. Don’t make this a habit.” But her hands are steady, and Y/n catches the briefest flicker of worry in her eyes.
The two have a very actions-over-words kind of relationship. There are no big, heartfelt speeches—just quiet moments of understanding.
Ada has an annoying habit of disappearing on Y/n, but they’ve gotten good at keeping up.
If she ever goes off-grid for too long, Y/n don’t hesitate to track her down. She pretends to be unimpressed when they show up. “Took you long enough.” But deep down, she’s a little proud.
They both played games of deception with each other before—planting false leads, leaving misleading clues—but there’s always an unspoken rule: neither of them ever takes it too far.
Their conversations are always laced with sarcasm and dry humor.
“So, where have you been?”
“Oh, you know, taking a vacation. Sightseeing. Dodging bullets.”
Despite her cold exterior, Ada does show affection in subtle ways. A quick but firm shoulder squeeze, fixing Y/n’s collar absentmindedly, or giving them a rare smirk when they one-up her.
If Y/n ever gets the better of her in a conversation, she’ll give them a slow, approving nod. “Not bad. Maybe I did teach you something.”
No matter how much distance she puts between them, Y/n is one of the few constants in her life.
They’re the only people who see past the mask, who know when she’s exhausted when she’s second-guessing herself, even when she won’t admit it.
If Y/n is more open than Ada is, they sometimes get frustrated with her secrecy, but at the end of the day, they understand why she is the way she is.
If Y/n is more like her—guarded, mysterious—it’s a silent game of who blinks first when it comes to being honest. But in the end, they both just know that, despite everything, they’d do anything for each other.
There are rare moments where Ada lets her guard down around Y/n. Maybe it’s after a long mission, or when she knows no one else is watching. She’ll sit next to them, say nothing, and just exist in the same space.
If Y/n ever reminds Ada to take care of herself, she just chuckles. “I should be telling you that.” But she actually listens—at least for a little while.
No matter how many times she disappears, she always comes back. And when she does, there’s always that one simple reassurance:
“I told you I’d be fine.”
“…Yeah. I know.”
— Bonus Headcanons:
Ada will insist she’s not babysitting Y/n, but the way she subtly manages their safety says otherwise.
“I’m not your bodyguard,” she says—right before she shoots the guy who had a gun trained on them.
If Y/n tries to point it out, she just smirks. “That wasn’t for you. I just didn’t like his face.”
They both have a habit of pushing each other’s buttons just for fun.
If Ada’s being too cryptic, Y/n starts responding in even more cryptic ways. “Oh, I understand, Ada. The red fox crosses the Silver River at midnight.”
If Y/n’s being stubborn about something, Ada will start mirroring them just to be annoying. “Oh, so now you don’t want to listen to me? How interesting.”
Ada rarely gives compliments, so when she does, Y/n knows she means it.
“Nice work,” she mutters after a mission, barely looking at them. Y/n blinks. “Wait, was that a compliment?”
“Don’t push your luck.” But she’s smirking, and Y/n knows it’s the closest thing to the pride she’ll openly show.
Y/n and Ada have an unspoken rule: if one calls for help, the other comes. No questions, no hesitation.
Y/n could be in a completely different country, and if Ada gets a single coded message from them, she’ll find a way to get there.
Likewise, if she ever actually asks for their help—which is rare—Y/n knows it’s serious.
It rarely happens, but in rare moments, Ada will say something meaningful.
Maybe it’s after a near-death experience, or perhaps they’ve just been through hell together. Either way, Ada finally drops her usual teasing tone and says, “You know I’d never let anything happen to you, right?”
It’s quick, it’s quiet, and if Y/n blinks, they’ll miss it—but it means everything.