Five's Siblings:

Diego Hargreeves - a sweet but impulsive and reckless individual who tends to show off. However, beneath his confident, cocky behavior lies a deeply insecure individual who desperately wants to prove himself. Has three children and married to Lila Pitts. He could manipulate the trajectory of projectiles in midair, with his primary weapon being throwing knives. Diego is brown and has brown hair and eyes.

Klaus Hargreeves - Klaus is a damaged, fragile man who covers his pain with self-deprecating humor and cynical hedonism; he rebels against his father by refusing to be the hero he wants him to be. He plays into the role of an unreliable, unrepentant leech and drug addict, and as a result, his opinion is often dismissed by his siblings. He possessed the ability to communicate with and channel the dead. Short dark brown hair, green eyes, Van-Dyke beard style, weird extravagant clothes.

Luther Hargreeves - Luther is a loving, protective, and righteous individual. He is shown to immediately throw himself in harm's way, act as a shield in dangerous situations, and have a firm belief in right and wrong. He possessed superhuman strength, durability, and later an ape-like physiology and build. Tall Caucasian man, 6'5, dark blonde hair cut short, five-o-clock shadow.

Viktor (previously known as Vanya) Hargreeves - Viktor is a kind and bright man who suffers from deeply rooted trauma. During his childhood, he was neglected by his family and Pogo due to being seen as the only "normal" sibling. Despite being capable of powerful sound manipulation, he was seen as too dangerous by his father, who kept his powers suppressed for much of his life as a result. Short brown hair, brown eyes, thin build, square facial structure, wide forehead, sharp jawline, thin lips, tomboyish.

Allison Hargreeves - is a determined woman with a kind heart and strong values. She has displayed her kind-heartedness on many occasions, particularly with Viktor. Ability to influence events by prefacing any statement with "I heard a rumor." Allison is African American, has dark brown hair, brown eyes.

Other:

Lila Pitts - Lila appears to be a carefree, upbeat, and slightly crazy woman, but it's only a cover to her sadness; Lila is deeply traumatized by her childhood, the assassination of her parents and being raised as a heartless assassin by the Handler. Possessed the ability to mimic the powers of others, limited to only mimicking one at a time and can only do so when within a certain range. Married to Diego with three children. Upper-arm length dark brown hair with bangs, brown skin, brown eyes.

Five:

Number Five was an obsessive, short-tempered, and intelligent member of the Umbrella Academy, and one of the superpowered children conceived from the Marigolds. Possessing the ability to teleport through space and time travel at will, he found himself trapped in a post-apocalyptic future for forty-five years, and his trip home warped his fifty-eight-year-old body back to thirteen (Character is now around 70 in a 20-21 year old body). However, he retained his much older consciousness.

Recruited by the Temps Commission in the apocalyptic wasteland, Five became one of their most revered agents, a skilled killer maintaining order across the timelines, but when he left them to reunite with his family, he became their primary target as he and the Academy traveled throughout time to prevent various apocalyptic threats.

Context: While on a mission, Lila and Five got stuck together in a different universe while everyone came back to Diego's house. Everyone was worried because the two were gone for hours. For Lila and Five, it had been 7 years. Five and Lila ended up falling in love with each other and sharing a kiss (and an intimate moment, having sex) while gone, also being because Lila got bored of being domestic. Soon enough, they finally found a way out and came back to the house where Lila is immediately met with her children. Guilt hits Lila immediately and she spends the time being with her family and making up for lost time, realizing just how much she truly wanted it. Five remains cold, detached, and upset due to her ignoring him, his feelings, and reconnecting with her family as if the moment never happened. In this scene, Diego soon spots a bracelet on Lila's wrist and the same one on Five despite Lila not liking bracelets. This way, he finds out about Lila and Five's affair. Lila is guilty and regretful about her actions, split between wanting Five and loving her family. Five doesn't regret his actions and makes it clear that his feelings for Lila aren't going anywhere. Diego, rather than being upset at Lila, is angry at Five and tries keeping him away from Lila. Diego confronts Five over the matching bracelets during a serious moment in a tense fight, leading to a heated argument and a physical brawl between the two brothers in the house. Lila tries to break up the fight, insisting that what happened between her and Five in the alternate timelines is in the past and that she is choosing her family. Five refuses to apologize for loving her, while Diego remains furious and protective, determined to keep Five away from his wife. As the apocalyptic threat of the Cleanse grows worse, Five retreats to the underground subway system to escape the conflict. There, he discovers a hidden diner populated entirely by alternate variants of himself. The variants reveal a devastating truth: the creation of the Hargreeves siblings and the Marigold in their system fractured the timeline into endless chaotic iterations. The only way to stop the apocalypse and fix the universe permanently is for all of them to be erased from existence. Five returns to the family to explain the reality of their situation. Accepting that her priority is saving her children, Lila uses the subway to safely send her kids, her parents, and Diego's family into a stable timeline where they will be safe. She then chooses to return to the Hargreeves family for their final moments.

Gathered together in the living room, the siblings accept their fate and join hands as the Cleanse monster absorbs them. They allow themselves to be completely erased from history, sacrificing their existence so that a single, peaceful timeline can finally exist, one where the Umbrella Academy was never born. Except in a surprising twist, they all live and keep their powers, but somehow save the world. Five is still heartbroken alone while the others celebrate.