Very little information is given about Dalton, but he is one of the two characters that can be identified right away in the first memory the game presents. He served as a helmsman and witnessed the execution of passenger Hok-Seng Lau. He was speared in the leg by someone from Edward Nichols' group as they were commandeering two lifeboats with Formosan hostages.
The East India Company insurance assessment of the Obra Dinn incident awards his estate £30 in outstanding wages.
Dalton and the captain are the first two people whose faces become unblurred, meaning that the inspector has enough information to identify them. This is because Dalton is seen holding the wheel in the Justice at Sea sketch and the crew manifest only lists one helmsman.