Which came first, the internet (ARPANET) or Mario?

the internet (ARPANET) came first, by 12 years. The first message was sent between two networked computers.

Side by side

the internet (ARPANET)

On 29 October 1969 a team at UCLA tried to send the word "login" to Stanford. The system crashed after two characters, so the first message ever sent over the internet's ancestor was "lo". By the end of that year the network had four nodes. The internet is twenty years older than the Web, and confusing the two is the single most common error in this whole subject.

Mario

Mario first appeared in Donkey Kong in 1981, credited as Jumpman, four years before Super Mario Bros. of 1985 made him a household name. He wears a cap because animating hair at that resolution was impossible, and dungarees because they made his arm movements legible against his body — the design is entirely a consequence of an 16×16 pixel sprite.