This one’s a little bit tricky, because the question of whether the Mountain — who made it on the list for war crimes committed at Harrenhall in season two — is truly “alive” anymore is a complicated philosophical discussion: He’s a mindless, undead foot soldier! Still, if there’s even the slightest possibility he can be killed, then dangnabbit, Arya will try to kill him.
The Red Woman
Does it still count if it’s not her real name? Probably! Arya added Melisandre to the list after she took Gendry from the Brotherhood Without Banners in season three, and since Arya doesn’t know her friend was soon released to set Westeros’ long-distance rowing record, the older woman remains on the list.