User blog comment:Rassilon of Old/Young Justice spoilers at Comic-Con 2012/@comment-4935403-20120716222631/@comment-1038387-20120716224026

No, the teleporter was the skinny guy. We don't know who the girl is, or why she's dressed that way. Most seem to think she's Katana and Samurai rolled into one.

The teleporter is possibly Eduardo Dorado Jr., since he saves Eduardo Dorado Sr.. Ed Dorado Sr. is, as far as I've been able to research, an original, non-existing DC character. The Sr. implies a Jr.

After "Beneath", it fell into place: with Tye Longshadow, an Apache chief, and now Ed Dorado Jr... this has to be Super Friends' El Dorado, a teleporter.

That was before the teaser came out.