Kasuga Haruhiro

Yasuki Haruhiro was a Crafty Sailor of the Crab Clan who joined the fledging Tortoise Clan as Kasuga Haruhiro.

Gaijin Attack the Empire
Haruhiro was the naval commander of the Yasuki during the Battle of White Stag and the Battle of Raging Seas. Haruhiro was considered one of the greatest sea tacticians ever, though few realized the dishonorable lengths to which the Crab went in pursuit of victory against the gaijin.

Tortoise Clan
When the Tortoise Clan was founded after the gaijin were defeated, Haruhiro was one who joined it.