Is an artificial intelligence capable of love? For that matter, is Master Chief? Throughout the "Halo" series, the supersoldier known only as John-117, aka "Master Chief," has never been without his A.I. companion Cortana.
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The games never overtly address romantic feelings between the two, but in "Halo 4," when Cortana's program reaches the end of its functional life span, Chief drops everything to try to save her — and fails. Cortana dies defeating the Forerunners' new commander, and uses the last of her strength to form herself into a hard-light construct capable of touching Chief for the first — and last — time.