Resident Evil 2 Remake

She’s an intern for Umbrella, more in the medicine department. She’s in the city at the time of the outbreak, ending up at the police station at the same time as Claire. She meets Leon for the first time when in the parking garage (She rushes ahead of Claire during the first Willy Birkin fight), she also meets Ada too. Ada meets her first and kinda uses her to fish info about Umbrella from her. Her and Ada do have a bonding moment when they both patch up Leon. Celly does tell Ada that she was planning to be a nurse if the internship didn’t go well (Which it wasn’t because of the freakin’ zombie apocalypse), since she did go to medical school. Celica insisted on staying with Leon while Ada went after Annette, but Ada tells her he’ll be fine and that she should investigate the area. She reunites with Claire in the underground area, also meeting Sherry for the first time. (This is right after the whole Sherry suffering from the virus thing). She stays with Claire for the rest of the game, even watching over Sherry when the virus is really affecting her. She ends up escaping on the train with Leon, Claire, and Sherry.

Resident Evil 4

She is sitting in the car with Leon, making awkward conversations with the escorts, since she doesn't know what to do. She does get separated from Leon once they meet Luis. They end up also getting separated as the cult gets her and locks her up in the boat shed. When Leon rushes in there infected, she takes care of him while he’s passed out. Once Leon wakes up, he catches Celly on what’s going on. They go and save Ashley at the church, Celica checking to make sure the cult hasn’t hurt her. When they meet up with Luis, he flirts a bit with Celica, which she kinda rejects by putting herself down before focusing on the threat at hand.

Resident Evil 4 Remake

Some events are similar to the original, like her being in the car with Leon. When they end up getting separated once they find Luis, Celica isn't in the boat shed, but Luis stumbles upon her in another room in the factory. He ends up freeing her and taking her with him to the house where he's hiding out. Celica sees Luis calling someone and jokes about him calling his girlfriend. She then finds out it's Ada, which surprises her since she hasn't seen her since Leon was injured in RE2R. Once Leon and Ashley enter the house, Celica is glad to see him and hides with Ashley while Leon and Luis take care of the ganados. They both get formally introduced to each other, and get to know each other more once they leave with Leon. Leon just stays quiet and lets them chat. She watches over Ashley during the Mendez fight. Once they get to the castle and the whole infected Ashley thing happens, Celica is with Ashley during it. She's trying to comfort her since Ashley's scared. The two stay in the place near the maze, Celica keeping watch for danger. Once they reunite, Leon tells Celica about Ada (Which Celica forgets to tell him about Luis calling her). They continue through the castle and once they get separated from Ashley and are in the cage killing ganados, they have a moment. They have a small chat about Celica doubting herself and Leon reassures her that she’s amazing at what she does and shouldn’t put herself down. They do end up in the underground area of the castle together and reunite with Luis. During the Kraseur knife fight, Celica tries to help Luis out, but he refuses to accept her help. When he calls Ada, she can hear Celica in the background trying to help him. After the Kraseur fight, Celica is a bit in an emotional distress after not being able to save Luis. This was the first time she couldn't help someone out, Leon having to reassure her and comfort her before they go to save Ashley. On the boat with Ada, Celica is a nervous wreak (two people she likes in one place) and is also a little shaken from the Salazar fight (She did not like him).

Resident Evil 6

Celica has recently started to date Leon (even though Leon still has some feelings for Ada). She accompanies Sherry to go find Jack at first, since she isn't restricted in just helping Leon. Sherry sometimes pushes her away when she gets injuried because of her auto healing. When they meet up with Chris, Celica sorta ends up getting seperated from Sherry and Jake, having to go back with the BSAA. She isn't there when Leon kills the president, but back with Hunnigan supporting behind the scenes. Celica does send texts to Leon to make sure he's ok and stuff. Celica likes to send chat stickers, Leon smiling a bit whenever she sends them. She only gets really involved once Leon and Helena fake their deaths and go to China. She goes after Hunnigan tells her to help assist the two of them. Celica meets Helena for the first time, Helena noting that she is Leon's girlfriend and how Leon looks to still have feelings for Ada. Leon does catch Celica up to speed with the whole Ada thing, which honestly surprise her. She treats both Leon and Helena's wounds when they need it and also helps them fight any infected creatures. Once the plane crashes, Celica is relieved to see that Sherry is ok, since they got separated from each other. She of course asks a ton of questions while they are fighting the B.O.W., which Sherry can't really answer in their current situation. When Leon chases after Carla and they meet with Chris and Piers, those two remember Celica from when she was helping Sherry. Chris didn't even know Celica and Leon were dating. Near the end of the game, Celica is mostly with Helena when Leon and Ada are fighting Simmons.

Resident Evil Vendetta

Celly and Leon are engaged! She’s at the bar with him, there to comfort him. She meets Rebecca for the first time and they get along well (They were both medics at some point). Celica is kinda iffy about Leon going to help Chris and Rebecca thanks to his current mental state.

Death Island

She’s off screen for this movie, but Leon shows pictures of her and their daughter to whoever he can (especially Jill). Celica isn’t a part of the DSO anymore and is now a stay at home mom. They had their daughter, Ciel, a few months after they got married. (She’s either a few months old or a year old!).