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A child actor we first met on “The Adventures of Pete & Pete” as the quirky, arm-cast-wearing best friend Nona F. Mecklenberg.

But on hearing the news of her untimely passing, Wednesday at 39, my mind went straight past Dawn Summers on “Buffy the Vampire Slayer” and Georgina Sparks on “Gossip Girl” to Nona F. Mecklenberg, the character played by Trachtenberg — the names rhyme — in Nickelodeon’s “The Adventures of Pete & Pete,” the greatest children’s show of the 1990s, or any other decade, and, really, one of the best shows ever to emanate from a television.

Trachtenberg and Nona set out together on that sea of life.

Nona’s forearm was permanently in a cast, not because of any slow-to-heal injury but because she liked the way it made her skin itch.

Nona’s slice of the titles shows her in a blur of motion, extracted from the third-season episode “Dance Fever,” in which at a school function she tries to avoid dancing with her doting father, played by Iggy Pop, who croons a plea for her to join him on the floor: “I held you on my bended knee / I tucked you in the sack / I carried you around so much / I sprained my lower back.”