The 6 memory traces from the PROJECT Zed teaser

Trace 1 is unknown, maybe for a new champion

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..." Most likely because she is a protector, her theme is the sun (light), and one of her quotes is "stand and fight"

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..." because even tough he lost his wife, he isn't lost in dispare.

Trace 4 "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..." because of his two quotes and he is the only tempest in this game.

Trace 5 "Dark sight, shadows marked, death lives beside. Silencer, he follows. The shadow is within. Blood soaked, he stands. Vanish..." Most likely

Trace 6"Weaves, unweaves; unraveled defense, dashing forward blade gleaming. Caught orbiting one vision, dashing, striking, blade dancing..." because of her unraveled defense (her W) blade gleaming from the moon. This could also for because of her unraveled defense (E) dashing, dashing, striking. Maybe even because of blade dancing, dashing, unraveled defense (her w blocks everything). I think last one is most likely is Fiora