1. Cortana (Halo)
It's hard not to feel some sort of affinity toward gaming's most iconic AI hologram, assuming you've played at least a couple of the Halo games. Her playful, witty banter made slaughtering an entire race of aliens as Master Chief far more interesting, and because she was our voice-in-the-ear companion for so many years, knowing she's gone for good is eerily depressing.
And it's that sentimental attachment that made it all the more bizarre to watch Cortana, our pal, become increasingly sexualized over the span of the Halo series. She'd always taken a female form, and her holographic outfit had always been composed of 0s and 1s flowing over her body. But by Halo 4, that outfit became thinner and thinner, and that body more defined and exposed. Still, we'll never forget her companionship, or her final words in the game: "Welcome home, John."