[THEORY] Deadeye exposes things for what they really are
My speculation on Deadeye: he/she is named Deadeye for being able to see things for what they truly are.
How does this relate to Garen, Sona, Zed, and Vi? I think Deadeye has "shot" them in particular places to reveal the truth about these characters that others may misunderstand.
#Garen http://i.imgur.com/qFXFyFw.jpg Garen is purported as a stalwart symbol of justice. Strong, unrelenting, fortuitous. In Garen's picture, it looks at though he is shot through the heart. What comes out the other side of his body, appears to be glass. I think what is trying to be conveyed here is that Garen actually has a fragile heart. Being in love with Katarina, but never being able to be with her, may be breaking his heart. The vanguard of Demacian justice, with a fragile heart? No way! But Deadeye sees the truth of Garen.
#Zed http://i.imgur.com/fSD9bjy.jpg Zed was so headstrong about the dark arts. Defiant and secretive. In Zed's picture, he's clearly been shot through the eye, and there are (what looks to be) cherry blossoms coming out. How are cherry blossoms and eyes related? Eyes are our vision, and we often association what someone pursues as their "vision" in life. Cherry blossoms, by nature, are fleeting. The blooms are only around for such a little time. I think, Zed, by pursuing the shadows and the dark arts, he thought he was pursuing a hidden truth. In his lore, when he confronts the master for the box, Zed screams out in pain, but leaves the building unscathed. Perhaps not physical pain, but mental frustration. Perhaps the master showed him what was truly in the box, and it contradicted what Zed thought to be true. And Zed's moment of clarity, his vision in life, was wrong, and thus, fleeting. Gone. But he's in too deep with these dark arts. He has so many followers, and they've come so far. Is Zed deceiving his followers and himself, not wanting to admit he was wrong? Is it all just a charade now? Deadeye sees the truth of Zed.
#Sona http://i.imgur.com/4Kcy9Su.jpg I think a common misperception with mutes is that since they cannot verbalize what they feel, they must not feel strongly. Which is completely untrue, but we associate someone's feelings with their verbal communication. We may not feel loved unless someone tells us. We may not know someone is sad unless they tell us. Perhaps this is the case with Sona. She is misunderstood because she cannot verbalize it. What about her etwahl? Sona's lore says that she can manipulate the emotions of her listeners. She could make them feel sad, happy, or a myriad of emotional mixtures. However, that doesn't mean that Sona can use the etwahl to communicate how she is, how she's feeling. Sure, she could try to communicate depression by making her listener feel depressed, but how would the listener know to think "oh, this is how Sona is feeling"? When I look at Sona's picture, I see a wispy fire leaving her mouth, representing a form of passion and emotion. People who interact with Sona may forget that she can feel, on the basis of her being mute. But Deadeye sees the truth of Sona.
#Vi http://i.imgur.com/c9J30qM.jpg Vi is depicted as a rough-and-tough gal who loves to pound people's faces in. "Punch first, ask questions later". Surely, Vi is just a gruff woman who revels in hard work and violence. When I see Vi's picture, I see smooth, gentle hands. The kind of hands that can be tender, loving, and caring. How could someone so violent and tough, have any room to show affection to others? How could someone who uses their hands to hurt criminals, also use their hands to help others? Deadeye sees the truth of Vi.
TL;DR- Deadeye sees that Garen can have a fragile heart, despite being so outwardly strong. Deadeye sees that Zed is wrong and that his moment of clarity of fleeting. Deadeye sees that Sona still feels things despite not being able to communicate it. Deadeye sees that Vi still has the capacity/desire to use her hands for healing and care, rather than violence.
Again, this is all just my own speculation. Feel free to let me know if you agree or disagree, or if I've missed the mark somewhere.
