In 'Kidz', Zack reveals the locations of Tinga, Jondy and Zane, but can't remember anything about Krit, and doesn't mention Syl at all. But when Max tells Zack who has checked in after they are exposed, Syl and Krit are mentioned like they checked in together.

In AJBAC, the flashback scene, where a young X5 soldier shoots at a crow, misses and hits her brother, the young X5 is Syl. Syl's designation and barcode was never formally confirmed.

Syl obviously has a destructive streak - noting that she some how managed to get a hold of Russian hand grenades for the raid on Manticore. She follows Zack's orders to the letter, making her almost the polar opposite of Max. She and Krit were responsible for the blowing up of the main and auxilary generators in the complex, during AJBAC. We aren't told if they managed to achieve that.

Syl's percieved as a fun-loving, gun slinging type, who is incredibly close to Krit. It's insinuated that they are in a relationship but it is never confirmed,

While lots of rumors for the second season included the return of Syl and Krit, unfortunately neither of the actors were available.