Barisu

When Cross was still a part of Stea, Barisu acted as commander whenever Cross was away. Although he acted respectful, he evidently despised him and though he would be better suited to commanding Shin. During the Roc-Bird arc, he even fired Shin's soul-absorbing laser at the city, not caring about whether or not Cross would survive. After Cross defected from Stea post-timeskip, Barisu took his place as commander of Shin. However, it wasn't long before Miko uploaded her consciousness into the Shin, taking over Barisu's body and using his body to still maintain control of those on-board without revealing her nature as the Shin itself. (Source: Wikipedia)