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What if I use I Still Function during my turn to bring back Elita-1 and then, at end of turn, when she is KOd again, she reveals another I Still Function? If I am able to bring back a character with it, when is that character KOd by I Still Function's effect?

Almost immediately. At the end of that turn.
Source: Wizards of the Coast (2019-05-17)    【Link to Ruling】
Tags: Captain Elita-1, Special Ops • Ranger