When Hirohito died in 1989, he was repainted with a US-Japan crossed flags symbol on his stern.
In the early 2000's, he was rebuilt with a ALCO 16-251F diesel engine taken out of a VIA LRC locomotive. After some teething troubles, he laid in Lucky's Yard awaiting conversion to steam, so he could be like the other tugs. He was converted to steam in 2006, and is currently seen switching around the port.
Hirohito is based off the Tategami-class salvage tugboat, a class of rescue ship/tugboat of the Imperial Japanese Navy (IJN), serving during World War II.