This is my little break-down of how I think Cypher would react to everyone's character ^^:
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Evelyn
Intrigued is one word. Cypher would never approach her but would be content to watch from afar (Not creepy at all). They don't mean any harm, but they are curious about the shadows that Evelyn possesses. When around her, I think Cypher would be a little fearful, especially because of her RBF.
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Axel
(Unknown since he isn't finished)
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Melione
I feel like Cypher would be really wary around her at first since the woman has a trail of spirits following her and an aura of death around her. But I also feel like they would warm up to her a lot quicker since both of their abilities revolve around death. I see them being close friends after a little while, and maybe a maternal bond forming between them. Maybe, I don't know. Cypher's a lonely little bud.
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Kaia
Cypher wouldn't be as scared or wary around her since she doesn't seem like a threat or anything like that. She seems calm and friendly, so Cypher would either turn their attention to someone else to watch or possibly interact with her. It's a stretch for them to be the one that approaches Kaia, but I kind of see that happening if they have to.
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Irbek
I don't see them getting along at first. First off, absolutely terrified. Someone could do a lot of damage with abilities like his. Also, he seems quite serious about his work and abilities, and at first glance, he's not someone Cypher would want to interact with. Don't know what kind of relationship would be toward the middle and end, but it's safe to say that they will not be forthcoming with Irbek and would most likely avoid him.
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Soleil
Due to their lighter eyes, Cypher can't handle bright light very well, so that might put a damper on their relationship lol. On top of that, they wouldn't be too sure about how to handle her firey personality. They admire her for it, but feel like they wouldn't be able to keep up. Between that and her cold mask that others see at first, Cypher feels like she can switch up at any moment, and for that reason, would probably try to avoid or stay away from her.
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Mattis
Similar to Irbek, Cypher would be terrified. Definitely avoid him at all costs in the beginning due to his ability to manipulate others' senses and emotions. How could they be sure that whatever they were feeling was genuine if they can't be sure he wasn't using his abilities? That, and he is a pretty imposing guy on the outside. But, after a while, I feel like Cypher would be a little less prone to panicking around him and start to enjoy his company. The golden retriever attitude definitely makes them more comfortable around him once they are sure he isn't manipulating their emotions. Might also help since half of their emotions don't even belong to them.
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I feel like Cypher would either really like and be really interested in Castoros or dislike him. Spirits ache for life again, and whenever he's around, I can see them hanging around him for just a little taste of life again, even if he is unaware. This would either cause Cypher to be intrigued and curious or resentful. He seems so full of life, maybe they'd gain some knowledge about how to interact with the living through him. It's a flip of a coin, really depending on how he acts.
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Kemila
Once they learn about her abilities, I feel like Cypher would both feel sad for her and sort of a kinship. While Cypher tends to receive memories from the spirits around her, past experiences that usually tend to end in nightmarish circumstances, Kemila has the opposite. Cypher would remain at a respectful distance, never coming over to talk or anything, but wouldn't be as suspicious or wary around her. They'd also probably be a bit more friendly and open to her.
Would never let her see into their dreams though. They don't want her to get roped up into the massive amounts of emotions, dreams, nightmares, and memories of the spirits around her.
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Riku
While not particularly fearful of his abilities, his personality is what makes Cypher wary. The aloofness is was worries them the most. If he has no ties or relations with those around him, what's stopping him from turning them all in? Overall, don't see them getting along very well at first, not until they are sure that he won't betray other Enhanced.
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Chase
Similar to Riku. Cypher won't be comfortable around him if they aren't sure of his loyalties.
Winter 
Day 
Fog
