Project Skin Line Theory
Well, thought I'd try my hand at this since it's late and I'm bored haha but after about an hour of theorycrafting with friends, this is what I got:
Trace 1 "Trace Lost" Gonna go with the idea this could be a teaser for Yone (Yasuo's dead brother) due to the theme saying "Do not trust corrupted memories" which could mean that Yasuo's memory of Yone's death was flawed and maybe something caused him to remember falsely. Also, none of the other champions I'm theorizing that are in this line fully fit into the face of the Poster Champ shown on surrender@20. Lastly, on the official page, the trace number is identical to Yasuo's while the others are all different making me assume that this guy definitely has to share a relation with him/
Trace 2 "Brilliance in pieces, shrouded in ethereal flame. Protector, light bringer. Lone voice. Stand and Fight. In death heavy fields, now still she stands, light washes over..." Took a bit, but narrowed it down to primarily Leona and Kayle as they both can be described as protectors (Leona more so than Kayle) as well as they both are about standing and fighting for what you believe in. If I had to bet, I'd go with Leona simply because she does worship the sun which is obviously centered around light.
Trace 3 "Piercing flame, he, cast in light. I see his vision, free from shadow, a blazing melody. Beyond the light, nothing, purity bound in fury..." Trickiest out of all of them in my opinion, but candidates so far are Lucian and Tryndamere. Both could be completely off and Trynd is a longshot imo but Lucian could fit here because he does have an ability named Piercing Light which is more or less piercing flames as well as his fury over the loss of Senna to the shadows. Still a work in progress.
Trace 4 - Yasuo "Tempest, a blossom caught in drift, fluid form. He speaks. Death is like the wind... he is a storm, blade howling... Always by my side..." Nothing to really explain here. It's Yasuo, lol.
Trace 5 "Dark sight, shadows marked, death lives beside. Silencer, he follows. The shadow is within. Blood soaked, he stands. Vanish..." 2nd most obvious one imo to Trace 6. I think this would be a massive troll if it WASN'T Zed as we've longed for a Zed skin forever with a million and one concepts for the guy with just 2 skins lol. Not to mention the words shadow, vanish, and death being used sooooo Rito pls.
Trace 6 "Weaves, unweaves; unraveled defense, dashing forward blade gleaming. Caught orbiting one vision, dashing, striking, blade dancing..." A lot of conflicting views on this. But I'll show why it's the most obvious one right now. It's Fiora for simple reasons here. Blade dancing is mentioned, her old ultimate was called Blade Waltz. Waltzing is a form of dancing. Her new ultimate has her orbiting one vision as she goes around to hit all 4 vitals in an orbit around them. And to top it off, unraveled defense is exactly what she does by targeting vitals and unraveling defense by doing true damage.
TL;DR :
Trace 1 - New Champion Yone
Trace 2 -
or
Trace 3 -
or
Trace 4 -
Trace 5 -
Trace 6 - 
Thoughts? Opinions? Any champ you might think it'd be?
and I believe it is him in his project skin being shown in the portrait they show. Mastery Yi is also a master swordsman known for avoiding damage and then diving into the enemy with agility. I was reading the "orbiting one vision" part as referring to his multiple eye...tube...things. Multiple eyes all facing one vision.
is 2.