Ken-Ohki is Nagi's cabbit partner. Like Ryō-Ohki, Ken-Ohki can transform himself in a space battleship, although the configuration and color is slightly different than Ryō-Ohki. And like Ryō-Ohki, Ken-Ohki has developed a love of carrots.

Ken-Ohki and Ryō-Ohki also love each other, which complicates Nagi's almost obsessive quest to capture Ryōko. But this love had also saved Nagi from being killed by Ryōko, not to mention aiding Ryōko when she, Tenchi, and the knights Azaka and Kamidake stormed the Jurai palace to save Ayeka.