An inhabitant of Molokai, in 1788 Towereroo went aboard Princess Royal (Captain Charles Duncan) as translator and passenger. In addition to Duncan, he befriended her chief mate (and later commander) James Johnstone and surgeon Archibald Menzies. They voyaged to China where Towereroo was put on Prince of Wales. When they reached England, Johnstone put him in school where, according to Menzies:
In 1790, Towereroo accompanied Captain Duncan in an exploration of Hudson Bay. When they returned to England, Menzies' patron Sir Joseph Banks announced hopes that Towereroo would be helpful to British ships visiting Hawai'i. In 1791 he was put aboard HMS Discovery, along with Menzies and Johnstone. He assisted Menzies in exploring ashore and botanizing at Tenerife and, probably, elsewhere, making him probably the first Hawai'ian to visit South Africa, Australia and New Zealand.
When the expedition reached Tahiti, Towereroo decided he preferred to stay and marry a local girl. However, the Lords of the Admiralty had directed Vancouver to return him to Hawai'i, and Towereroo's wishes were not considered. The local chief, Pomarrey, protected Towereroo for a few days, but after "...much investigation, and some coercion..." returned the young adult to the British.
In March 1792, the expedition reached Hawai'i, where it was discovered that Towereroo's home island of Molokai was enduring a famine. He was therefore left with Chief Kaiana and a few presents, which the chief promptly took. Later visitors, such as Frances Barkley of the Halcyon, noted his perfect English and use of the English name "Charles". According to then-Lieutenant Peter Puget, English explorers found Towereroo "of infinite use in the management of the Natives."
Menzies reports that by being useful to Kamehameha, Towereroo had gained a plantation and he gained another by marrying a chief's daughter; ultimately he controlled around 200 "vassals". In the rough-and-tumble of Hawai'ian politics, his rapid rise and close relation with the "Britanee" were both assets and sources of jealousy; at least once Vancouver had to intercede for his life.
Little is recorded of this young man's eventual fate, who in his time was the most far-traveled of Hawai'ians.