Kamakura is a commando from the G.I Joe team and is the file name of Sean M. Collins who is from California, USA.
Kamakura is mainly known as one of Snake Eyes' students and throughout the 2000's normally works with fellow G.I Joe Ninja Jinx and is a member of Snake Eyes' Arashikage Clan.
Kamakura's character is a good old fashioned example of a reckless well meaning young student who has quite the potential, depending on the storyline.