Bloomfield was born in 1965 or 1966, one of three children of Allan Olaf Bloomfield and Myreine Alice Bloomfield (née Osborne).[1][2][3] His mother was a schoolteacher, while his father was a lieutenant colonel in the Royal New Zealand Infantry Regiment (Territorial Force) and a manager at Mitsubishi Motors in Porirua, and was appointed a Member of the Order of the British Empire in the 1974 New Year Honours.[1][2][4] He grew up in Tawa, a suburb of Wellington, and was educated at Scots College, where he was head prefect.[1]