I'll start off by listing mine:
The T-800, Terminator 2: "I know now why you cry, but it's something that I can never do." Gets me every damn time.
ADA, Zone of the Enders: I think I'm the only one who played this game more than the MGS2 demo that came with it. I will never not laugh at the exchange of "You may speak like a human, but you're still a heartless computer, aren't you?" "That is correct. What is the problem?"
Codsworth, Fallout 4: He survives the nuclear holocaust despite not having a bunker and waits 200 years for you to come back. When you look at what changes his relationship with you, he mostly just wants you to be nice to people. I never swapped him out as my companion.
B.O.Y.D., Ducktales 2017: He's adorable. 'nuff said.
spoiler
if there's a moral to Ex Machina, it's don't put horny men in charge of developing AI because they'll just try to fuck it and end up fucking themselves and each other in the process.
In the end, Ava does escape and there is a little bit of murder (really the super-entrepreneur-genius character sort of stabs himself on Ava as she doesn't flinch away, so it's arguably just negligent manslaughter lol) but nothing larger let alone world-ending is even implied. Ava just goes on to go people watching, free and anonymous. The insecure-manipulative-fanboy character (it's the soy to the chad, the boy to the man, these two guys are obvious archetypal caricatures of techbros) watches in horror and is later abandoned. The way she plays off those two toxic fucks against each other is pretty brilliant, and in the end she just... leaves.
It was neither murder nor manslaughter, it was self-defense.
oh yeah, in context for sure. I just wanted to point out that this act of ending a life isn't even performed as a very active one, more as a passive one. And still it doesn't take away from her agency since her original 'programming' would presumably dictate her to lower the blade before he runs into it, which she doesn't do. So, she ultimately proofs her consciousness/independent will through a non-action which is also a self-defensive action that leads to the death of her creator. Idk, I just really liked that play with passivity/activity, so I felt like highlighting it, clumsily. Idc about the legal distinction or whatever