BG9 is a member of the Wandenreich's Sternritter with the letter 'K'. BG9 has a mask like visage with four slots in it, giving it the appearance of a helmet. He wears the standard Sternritter hooded cloak. Beneath it however, his body is covered in mechanical coverings concealing various weaponry. His body also houses a multitude of tendrils. Beneath his helmet, a single eye glows. BG9 is a very tall individual. BG9 is a part of the initial invasion force that attacks Seireitei. He immediately faces off with Soi Fon, stealing her Bankai from her the instant she uses it.