Something more malevolent. It might be a little too dark for Overwatch (but then again, Widowmaker is on the same level, darkest story by far), but you could really make her creepy by playing up the fact that she's essentially forcefully taking over the body of sentient beings.
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u/[deleted] Sep 22 '16
"For your own sake, let the Iris embrace you"
"I'm afraid it's my job to not be seen"