Beast-Men
When a fighter of the Akugata performs the Ringi Beast-Man Wicked Body Change, he/she turns into a Beast-Man (獣人, Jūjin?), a fighting form that resembles the user's Rin Jūken style's animal and allows him/her to fully utilize that style's Ringi. They are each named putting the first kana of their beast's Japanese name at the end of it (Kamakiri (カマキリ?) is Japanese for Praying mantis).
Read more about this topic: Rin Jūken Akugata