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 So he avoids situations where he has to interact with Mike, which shows his jealousy in a more withdrawn way.
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.
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.
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.
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.
In fanfiction, Edward might be jealous of Mike because Mike is often getting more attention. For example, if they are in a group setting, Mike could be the center of the group's activities, always coming up with exciting ideas or being more popular among the other characters, which makes Edward green with envy.
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.
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 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.
Jason might show his jealousy through subtle actions like avoiding Percy during group activities or making snide remarks about Percy's powers when others are around.
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.