Aeon/Tropes

General

 * Always Save the Girl
 * Despite Ada's immense skills, Leon always goes to her aid if she's in remotely any kind of trouble.


 * Battle Couple
 * While Ada and Leon's workplace loyalties often put them on opposing sides, their loyalty to each other often trumps that as they'll team up against whatever enemy, B.O.W. or not, threatens them and fight together to take it down.


 * Because You Were Nice to Me
 * Leon's kindness and compassion towards Ada is the reason she becomes so attached to and protective of him.


 * Becoming the Mask
 * At first, Ada was only stringing Leon along, but she ends up actually falling in love with him.


 * Cannot Kill Their Loved Ones
 * Ada has been put in a position to kill Leon several times, but each time was unable to do it.


 * Conflicting Loyalty
 * Leon's loyalties to his government and to Ada often end up at odds with each other. In 6 he even points his gun at Chris Redfield in order to protect Ada. On the other hand, Ada has consistently sabotaged her own jobs in order to protect and help Leon.


 * Criminally Attractive
 * Ada's status as a criminal spy doesn't seem to hold Leon back at all.


 * Dating Catwoman
 * They are never quite on the same side whenever they cross paths, their relationship is even defined in files as "It's Complicated", yet they can't seem to rid themselves of each other.


 * Doppelgänger Gets Same Sentiment
 * When Leon runs into the other Ada in 6, he gives her the same loyalty, trust, and protection he gives the real Ada, not knowing she's a doppelgänger.


 * Everyone Can See It
 * The UST between the two and the bond they've formed is so apparent, multiple people have commented on their relationship, some supportive and others not so much.


 * Fate Drives us Together
 * Despite planning on never running into him again after Raccoon City, Ada keeps crossing paths with Leon, first 6 years later, then another year after that, then they decide to start seeing each other when they're not on jobs. Their bond only gets stronger the more they meet up.


 * Gunpoint Banter
 * The two regularly flirt while pointing weapons at each other, although it's clear neither has any intention of killing the other.


 * Hair Contrast Duo
 * Leon, the hero and all-around good guy with blond hair and Ada, the mysterious hard-to-read anti-villain with black hair.


 * Love Martyr
 * Ada is majorly disliked and not trusted by nearly everyone within the Resident Evil universe. Leon sees through her rough exterior and fights to save/protect her at any turn he's able to. Despite Ada's faults, she returns the favor for Leon.


 * Morality Pet
 * Leon is one for Ada, making him the one chink in her emotional armor. While she's readily taken advantage of him and lied to him over the years, Ada has also risked her missions and her life to protect him.


 * Mysterious Protector
 * Ada protects Leon in Resident Evil 4, 4 Remake, and Resident Evil 6. In 4 she saves him five times, although Leon is only aware of two of those saves. 6 has her supporting him via a helicopter on several occasions, and although Leon is more aware of her presence, he's never quite sure it's her that's helping him.


 * On the Rebound
 * In 2, Leon fell for Ada the day after a nasty breakup.


 * Second Love
 * Ada is Leon's second love, after he broke up with his previous, unnamed girlfriend.


 * Ship Tease


 * Shipper on Deck
 * In Resident Evil 6, Helena makes it clear that she knows there is something between Leon and Ada. She tries to get Leon to open up to her about his feelings for Ada, and when this fails, encourages him to leave her behind in order to go after Ada. In the closing scene, Helena returns Ada's compact to Leon for when he sees "her" again.


 * Single-Target Sexuality
 * Although Leon will jokingly flirt with other women, he's rejected all serious advances from them, citing Ada as the reason and in the 16 years they've known each other, he's only ever shown serious interest in Ada. In 4's remake, he calls himself a "one lady type of guy".


 * Unresolved Sexual Tension


 * Villainesses Want Heroes
 * Ada is an amoral spy who uses any tactic available to achieve her goals; however, she does genuinely love Leon and will always help him, even putting his safety above her own.

Moments

 * Bridal Carry
 * In 2, after Ada gets injured, Leon carries her in his arms to a safe location.


 * Comforting Comforter
 * In the Resident Evil 2 Remake, Ada covers Leon with her trench coat when he falls asleep after she patches him up.


 * Converse With The Unconcious
 * After Ada gets knocked unconcious by Simmons, Leon cradles her in his arms and talks to her, begging her to wake up.


 * Declaration of Protection
 * In the remake for 2, Leon tells Ada that she had protected him, and now it was his turn to protect her. In Resident Evil 6, Leon tells Chris that he's going to protect Ada, no matter what.


 * Did They or Didn't They
 * Leon and Ada had some form of rendezvous prior to Damnation, but Ada's question of whether they would "carry on from where [they] left off that night" leaves it ambiguous as to how far they got.


 * Dying Declaration of Love
 * In Leon's B route for the original Resident Evil 2, Ada tells him that she fell in love with him shortly before she dies.


 * First Kiss
 * In the original Resident Evil 2, they have their first kiss shortly before Ada seemingly dies. In the remake, it serves as a Shut-Up Kiss instead of a Last Kiss.


 * Go Through Me
 * In 6, Chris' chase after Ada ends when Leon intercepts the two, throws himself at Chris, and ends up putting himself between Chris and Ada.


 * Last Kiss
 * The kiss in Leon's B scenario of Resident Evil 2, after Ada gets mortally wounded, which also serves as their first kiss in that scenario.


 * Signed with a Kiss
 * The notes that Ada leaves for Leon in 4 have a lipstick kiss on them and in 6, the RPG she leaves him also has a kiss mark on it.


 * "Shut Up" Kiss
 * In the Resident Evil 2 remake, Leon expresses his concern for Ada's wellbeing, and she gives him a kiss midway through his sentence to get him to stop talking and focus on the mission.


 * Taking the Bullet
 * In Resident Evil 2 and the remake, Leon jumps in front of a bullet for Ada when Annette tries to shoot her.


 * Tuck and Cover
 * In 6, Leon protects Ada by cradling her under his own body, shielding her from Simmons' spray of rapid-fire bone fragments.


 * Was It All a Lie?
 * IN RE2R, Leon learns that Ada had been lying about being an FBI agent and was actually a spy. He confronts her, asking if was only using him. Ada is evasive, but is unable to shoot him, showing that she did come to care for him.


 * Worth Living For
 * After their kiss in the cable car, Ada assuages Leon's concerns about leaving her alone by telling him that she has something to live for — seeing him again.


 * You Must Be Cold
 * In Retribution, Leon finds Ada lying in the snow wearing only her dress. He takes his jacket off and wraps it around her to keep her warm.