At the start of the gift is Riley

The second one is Abbie

And the last is Zip

Spoiler for ep7: Engel found out about that you can get rid of the virus without killing the students...so he removed the virus from Zip who now helps The survivors. In the last ep (ep8) she revives Abbie but not Lana...

(Also Ep5, 6, 7 and 8 are not out yet-)