Saber is often a symbol of honor and power, and in relation to Rin, they can be written in fanfiction as two characters who grow to understand and respect each other more. Rin's knowledge of magic can be a key factor in their interactions. However, when it comes to lemon fanfiction, it's not a proper area to explore their true characters as it usually involves vulgar content.
One effective way is to show Rin's loss of interest in things he used to enjoy. For instance, if he used to love training or cooking, suddenly he has no enthusiasm for it. His appearance can also change. He might look disheveled, with messy hair and dark circles under his eyes. Writers can also use flashbacks to his happier times and then contrast them with his current depressed state. By showing how much he has changed, it emphasizes the depth of his depression. And his reactions to small things can be exaggerated. A minor setback might make him feel completely defeated, which is a sign of his fragile mental state.
Since I'm not familiar with this exact 'no rin light novel', it could be anything. It might have elements of mystery, where Rin is trying to solve a puzzling case or uncover a long - hidden secret. It could also be a romance, with Rin as the central character in a love story, experiencing the joys and sorrows of falling in love. Or perhaps it's a science - fiction tale, taking place in a future or alternate universe, and Rin has to deal with advanced technology and strange new worlds.
The sad story of Obito and Rin is a key part of the Naruto narrative. Obito was a young ninja with big dreams and a huge crush on Rin. When Rin was seemingly killed in front of him, it shattered his world. He thought that the ninja world was full of pain and betrayal. This led him to be influenced by Madara. He became one of the main antagonists, all because of his love for Rin and the unbearable pain of losing her. His journey from a hopeful young ninja to a vengeful villain is a tragic consequence of Rin's death.
In a fanfiction of Kakashi and Rin's love story, it could start with their time in the ninja academy. Rin was always drawn to Kakashi's natural talent and mysterious aura. Kakashi, on the other hand, was initially oblivious to Rin's feelings. One day, Rin got injured during a training session. Kakashi carried her all the way to the medical tent. That was the first time he realized how much she meant to him. As they grew older, their bond deepened, and they found themselves falling in love while on various missions.
There are several visual novels where Rin could potentially die, but one common one is 'Fate/Stay Night'. It depends on the specific route and choices made by the player.
Sesshomaru came across Rin when he was in a vulnerable state. Rin's innocent and caring nature drew them together. It was a pivotal moment that shaped their future interactions.