Sometimes, his jealousy is more internal. He'll sulk in the corner, not saying anything but just looking at Kagome with a sad and angry expression. He might not want to admit that he's jealous, but it's obvious from his brooding behavior. He'll cross his arms and turn his head away when Kagome tries to talk to him, until she figures out what's wrong and reassures him that he's the most important to her.
Inuyasha's jealousy also comes out in his words. He'll make snide comments to the person who has his attention. Like if he's jealous of a guy flirting with Kagome, he'll say something like 'You think you can just waltz in here and steal her away? She's with me!'. His tone would be full of irritation and possessiveness.
He often shows it through his actions. For instance, he'll start growling at the person he's jealous of. If it's another male around Kagome, he'll give them a menacing look and might even bare his fangs a bit. His body language becomes very tense and aggressive.
Another way is that Edward might isolate himself from Mike. He doesn't want to be around Mike because seeing him makes Edward feel inadequate. So he avoids situations where he has to interact with Mike, which shows his jealousy in a more withdrawn way.
His jealousy could also show in his magic. Maybe he tries too hard to outperform Fleur in magic tasks or challenges. He might be constantly comparing himself to her and pushing himself to the limit just to prove that he is better, which is a sign of his jealousy.
Luke's jealousy of Percy in Percabeth fanfiction is manifested in various ways. One way is through his attitude. He may give Percy cold looks or make snide remarks. In terms of actions, he could try to sabotage Percy's relationships. For example, he might try to turn Annabeth against Percy by highlighting Percy's flaws. He could also attempt to steal Percy's thunder during important events. By doing this, he hopes to make himself look better and Percy look worse, all because of his deep - seated jealousy.
Often, she becomes overly possessive. If she sees Percy talking to another girl, she'll quickly insert herself into the conversation. She might put her arm around Percy or give the other girl a look that clearly says 'he's mine'. This possessiveness is a clear sign of her jealousy in the Percy Jackson fanfiction world.
In fanfiction, Inuyasha might show his jealousy of Koga by getting overly protective of Kagome. For example, if Koga is around Kagome, Inuyasha could start growling or making snide remarks about Koga's presence. He may also try to physically insert himself between Koga and Kagome, as if marking his territory.
The jealousy in fanfiction can both strengthen and strain their relationship. On one hand, it shows that they value each other enough to be possessive. For example, if Inuyasha gets jealous when another man flirts with Kagome, it might make Kagome feel special. But on the other hand, too much jealousy can lead to fights. If Kagome is constantly jealous of Inuyasha's past with Kikyo, it can create a rift between them.
Jason might show his jealousy by being overly critical of Percy. He could nitpick at Percy's actions or decisions during quests. For example, if Percy takes a risk during a battle, Jason might comment on how irresponsible it was, while secretly he's just jealous of Percy's courage to take risks.
Well, in some cases, Robin might become overly possessive. He could start glaring at other characters who get too close to Starfire. For example, if another Titan flirts with her even in a friendly way, Robin might give them a cold stare.
Sakura's jealousy might manifest through her actions. For example, she could be cold towards Hinata when she sees Naruto and Hinata together. Maybe she makes snide remarks or tries to insert herself between them more often.
Well, in this fanfiction, Jason's jealousy could be shown through his actions and words. He may make snide remarks about Percy's power. Maybe he tries to undermine Percy's achievements. He could also be seen avoiding Percy because seeing him use his powers makes Jason feel inferior. Like when they are on a quest together, Jason might not cooperate as well as he should just because he's envious.