Kirito x Argo
Actually, I like this ship. Not OTP level, but it's actually okay. Argo is definitely in that weird part of Kirito's harem, which includes Klein, Suguha, Silica, and so many more. But this is one with Kirito that's not Kirisuna, and it's not half bad, in my opinion.
6/10
Reasoning:
Argo is a little shady, but Kirito never really has bad moments with her. Kirito has an obvious choice for the winner of his harem, so I couldn't go higher.