As one journalist described: Hal Jordan's mechanic was an Inuit unfortunately called "Pieface"—and despite fan speculation, that comes not from the ice-cream treat Eskimo Pie, which goes unmentioned in the early comics, but from an existing term for 'a person with a round face and a blank ... expression', according to the 1960 edition of The Dictionary of American Slang.

Yet Thomas Kalmaku, as he was formally named, was Jordan's smart, capable, and always respectfully depicted best friend, eventually becoming a business executive and more.

Kalmaku was one of the few people who knew Jordan's secret identity and kept a journal of Green Lantern's adventures, which he later published as a biography.

In Millennium, Kalmaku becomes a founding member of the New Guardians despite his lack of powers and helps Guy Gardner with his anger issues.

In it, he goes on a final mission on Jordan's behalf, eventually reconstructing the planet Oa and the Great Battery and mending his relationship with his family.