Chloe, but to a lesser degree, like Sully was in Uncharted 2.
TENZIN- he should AT LEAST make a cameo, he was the shizay.
Who should/shouldn't return for the next installment? And to what degree?
Personally I did not like Chloe. She just rubbed me the wrong way attitude wise. I do think Tenzin would be cool to see again. Maybe in a flashback cutscene? I'm not sure on this one. Just keep those 3 alive and well and i'll be happy.
I'd like it if Chloe could returns. She could create some romantic tension between Drake and Elena I guess.
But besides that, Chloe is badass, while Elena is, in Chloe's words, the "white-picket fence," girl next door type.
I like them both anyway, so I do hope they both appear in future Uncharted games (or at least Chloe, since Elena obviously will be in).