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Tear Jerker: Mulan
The destroyed village scene. Everybody's dead, the houses are in ruins, they find the remains of Shang's father's army, lying dead in the snow. Even Chi Fu has the sense to act appropriately horrified.
Also, when Mulan takes the little girl's doll, places it next to Shang's father's sword, and says a prayer. The inclusion of the doll just screams, "There were little kids in this village!"
When Mulan's family wakes to find that Mulan has run away, her father dashes out into the rain and slips in the mud, looking up to see her dropped decorative comb lying forlornly on the ground and, a little further away, the open gate - which confirms his fear of what his daughter has done. Mulan's mother runs to him, saying they should go after her or else she could be killed. The father's reply: "If I reveal her...she will be." Their look of parental despair is heart-rending.
"Reflection". Just...that. That horrible, horrible sense of being a disappointment, of feeling false and wrong and ill-fitted to what roles your family desperately needs you to fill? Uh, yeah, it hasn't gotten less familiar over time. Made even worse by this line in the movie: "If I were truly to be myself, I would break my family's heart". For many people, they feel they wouldn't have much problem with society knowing their secrets; it's allowing their family to see them for who they truly are that terrifies them. The fact that your family are the people who you should feel most comfortable with just makes this line heartbreaking.
The lines, I will never pass for a perfect bride, or a perfect daughter... Who is that girl I see, staring straight back at me?/Why is my reflection someone I don't know?
In Mulan II, there's Shang's Heroic Sacrifice and Mulan subsequently breaking down afterwards.
Following this, Mulan offering herself to marry the eldest prince of Qi-Gong in place of the princesses. During the marriage, Shang reveals himself to be alive, and Mushu, disguising himself as the "Golden Dragon of Unity" marries Mulan and Shang right then and there.
The look on Shang's face when he finds out his father was killed in battle and not only him the leader, it was that every single soldier and innocent civilian in that village had been killed along with him. You realize that all of those dead men lying down there were someone's husband, someone's brother, someone's father/son/cousin/uncle/nephew, and now they're never going home, which was why Mulan stole her father's war things and took his place to begin with, so she didn't lose him like that. Mulan finding the abandoned doll amongst the burned wreckage is one of the most cruel implied aversions of Infant Immortality ever shown — it only drives the point home even harder: Shan Yu and the Huns are merciless, bloodthirsty, and evil, and must be stopped.
Not only has Shang just stumbled upon the remains of his father, his father's battalion and the village they were meant to be guarding, but he's there because of Mushu's fake letter. He believes that his father sent to him for help and he's arrived too late.
When Mulan is revealed as a woman and Shang has to make the decision to kill her, or let one of his best friends, who also saved his life, go free. Made worse when Mulan tells him she did it to save her father's life;Shang just lost his own father to the war and knows exactly how she feels.
The looks on Ling, Chien-Po, and Yao's faces while this is all going on. The moment Shang pulls out his sword they don't hesitate to rush to Mulan's defense.
The dinner scene early in the movie. When Mulan is trying to tell her father he'll be killed if he goes to war, and he, frustrated, shouts at her to learn her place, causing her to run outside and cry privately. What makes this even sadder is that, normally, Fa Zhou seems really kind and caring towards his daughter, so it was very jarring to see him shout at her. Also, when you think about it, that was the last thing he said to Mulan before she ran away, so on top of worrying whether she'd die, there's also quite a lot of guilt.
The final scene when Mulan returns to her father. She gives him two of China's greatest treasures as an apology for disobeying him. His response? Cast them aside like trash and hold his daughter as tightly as he can, because he is a dad, and she is all he wants.
Fa Zhou: The greatest gift and honor... is having you for a daughter.
In the very beginning of the movie, just after the disaster with the matchmaker, Mulan returns home. Her father comes out to greet her, and she is so ashamed of her failures she hides her face behind a horse so he can't look at her.