S'yne Lokk/Chronology

Volume 10
She was first introduced as Murder Pierrot, which she wore a mask and a weird outfit at the time during her fight with Naofumi, Raphtalia, Filo, and Sadeena at the Zeltoble's Colosseum.

Volume 11
She later appears at Naofumi's territory, where she was holding a tray wanting to be served some of Naofumi's cooking. She was later pushed away by Naofumi despite her wanting to help him, but due to Naofumi's trust issue, he wanted nothing to do with her.

When Keel was almost about to die, S'yne appeared just in time to stop the Other Worlders from giving Keel a fatal attack. It was later revealed that she was able to appear just in time due to her teleportation skill where she was able to teleport to any of her needles.

Later, when Raphtalia killed the Other Worlders for good, S'yne was speechless and hinted that she felt joy. Knowing that the Other Worlders that had destroyed her world are now gone forever.

Volume 12
Due to S'yne voice being cut by static, she now uses an accessory on her Familiar to communicate with Naofumi and others.

In S'yne's spare time, she focused on earning money in the Colosseum which she shared half the profits with Naofumi at the time she was earning money she was fully unaware that Gaelion was rampaging and was upset that she couldn't help Naofumi when he could have needed his help. She also helped protect the slaves from both incidents involving the Bow Hero and the assassination attempt on Raphtalia.