With his friends like Nino, Adrien's use of the Peacock Miraculous could make them feel a bit left out at first. They are used to the 'normal' Adrien, and this new side of him with different powers could seem a bit alien. However, as they see him using the powers for good, they might become more interested and start to support him, but there could still be moments of misunderstanding. For example, if Adrien has to disappear suddenly to deal with a sentimonster, his friends might think he's avoiding them.
A plot twist might be that the Peacock Miraculous starts to have an unexpected effect on Adrien's personality. Maybe it makes him more assertive in a way that his friends find a bit strange at first. He could start to make decisions that are out of character for him, like taking more risks in battles, which could lead to both positive and negative consequences. He might also develop a connection with the Miraculous that makes it difficult for others to use it when he's around.
One possible plot could be that Adrien stumbles upon the Peacock Miraculous by accident while exploring an old attic in his mansion. He then has to figure out what it is and how to keep it safe from Hawk Moth.
You can try searching on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Adrien finds the Peacock Miraculous' in the search bar and browse through the results.
His character would likely become more complex. With the power of the Butterfly Miraculous, Adrien would have to grapple with the moral implications of using such a powerful and potentially dangerous item. He might become more cautious and less impulsive as he realizes the consequences of his actions.
With Nino, Adrien has a great friendship. Chloe might see Nino as just another one of Adrien's 'lesser' friends. In fanfiction, Nino could try to get Adrien to see Chloe's true nature, but Adrien is too trusting and gives Chloe the benefit of the doubt.
In many fanfictions about Lila and Adrien, their relationship can be quite complex. Sometimes, Lila tries to manipulate Adrien to get closer to his famous family or for her own gain. But Adrien, being the kind-hearted person he is, might initially be deceived by her lies, only to gradually realize her true nature as the story progresses.
The other male characters might have different reactions. Some might feel sorry for Mocha and try to support her, while others might be more focused on how Tsukune's departure will affect the overall balance of power or the group's dynamic. For example, if there are threats in the Rosario Vampire world, Tsukune's absence could make them more vulnerable, and they would need to adjust their strategies.
In many Miraculous Ladybug fanfictions, Felix and Adrien have a relationship that is shaped by their family ties and their individual personalities. Felix, being the more aloof of the two, might initially seem at odds with Adrien's sunny disposition. However, as the story progresses in the fanfiction, they could end up bonding over shared experiences or family secrets. There could also be scenarios where Felix's actions either help or hinder Adrien in his superhero duties as Chat Noir, adding an interesting layer to their relationship.
Some of his friends might be very wary at first. After all, Hades has a rather dark reputation. But if Percy can show them the good in Hades, they might gradually come around. For example, Annabeth might be initially skeptical but after seeing how Hades helps Percy in some way, she could start to accept the friendship.
Then, show his unresponsiveness through the reactions of other characters. If Ladybug tries to talk to him and he doesn't answer or even blink, it emphasizes his state. You can also use dialogue from the other characters to express their concern and confusion about Adrien's unresponsiveness.