Another scenario could be when Mikasa is doubting herself. Eren would take her hands, look into her eyes and say 'Mikasa, you are strong. You've been strong for all of us. Your strength is what has kept me going, don't ever forget that.' His affirmation helps Mikasa regain her confidence and reaffirms their bond.
In some fanfictions, Eren might comfort Mikasa when she has nightmares about losing him. He would sit by her side, stroke her hair gently and say things like 'I'm not going anywhere, Mikasa. You've protected me all this time, now it's my turn to protect you from these fears.' This shows his growth and his deep understanding of their relationship.
In some fanfics, Eren comforts Mikasa by reminiscing about their childhood. For example, he might talk about how she always protected him back then, and now it's his turn. He could say things like 'You've been so strong for me all this time, let me be strong for you now, Mikasa.' This kind of trip down memory lane can be really comforting for her in the story.
Often, in these fanfictions, Eren develops more empathy. He starts to really understand Mikasa's feelings. For example, he might realize how much his actions impact her and become more cautious. He becomes more of a protector instead of just a fighter.
One possible heartwarming scene could be when Hannah finds Harry sitting alone after a difficult event. She sits beside him silently at first, just being there. Then she might start sharing a funny story from her own life to make him smile. For example, she could talk about a time she tried to bake a cake and it turned into a big mess but how she still had fun in the process. This could make Harry realize that even in tough times, there can be moments of joy.
In some fanfictions, Naruto comforts Sasuke when Sasuke has nightmares about his past. Naruto listens intently as Sasuke shares his fears and regrets. Naruto then tells Sasuke how much he values him as a friend and teammate, and that he'll always be there to protect him. He might even joke a little to lighten the mood, like reminiscing about their early days at the ninja academy and the silly things they did.
One possible heartwarming scene could be when Hermione finds Snape in a moment of self - doubt. She might offer him words of affirmation about his skills as a potions master, reminding him how many students have actually learned a great deal from him. For example, she could say that his strict teaching methods, while intimidating, have made her and others more precise in their potion - making. Another scene could be Hermione using her intelligence to solve a problem that has been plaguing Snape for a long time, like a mystery regarding a potion ingredient's origin. This not only eases his worry but also makes him see Hermione in a new light. And perhaps there is a moment where Hermione simply sits with Snape in silence when he's had a particularly rough day, just being there as a comforting presence.
Perhaps after a fight with Ron or Hermione, Harry is feeling really down. Cho could bring him his favorite treats from the kitchen, like a treacle tart. They then sit together in a quiet corner of the Hogwarts grounds, and Cho listens as Harry vents his frustrations. Her presence and the simple act of listening are what comfort him in this scenario.
You can try Archive of Our Own (AO3). It has a large collection of fanfics including those about 'eren comforts mikasa'. The site has a great search function that allows you to filter by tags and ratings to find the ones you like.
One heartwarming scene could be when Harry takes Albus on a special trip to the Forbidden Forest. They walk among the ancient trees, and Harry tells Albus stories of his own adventures there as a student. This gives Albus a sense of connection to his father's past and makes him feel less alone in his own struggles at Hogwarts.
One heartwarming scene could be when Harry is feeling down about his past and Hermione just sits with him, holds his hand and tells him he's not alone. She might remind him of all the good he's done and how much he's loved by his friends.
One heartwarming scene could be Ginny simply holding Harry in her arms. She might run her fingers through his hair while he lets out all the pent - up emotions from the war. The warmth of her embrace makes him feel safe for the first time in a long while.