Sinis and Dex

Sinis and Dex are twin Mecha-Ude who have protected Aki since her early childhood through a process called derization. They function as a single unit with her, though the siblings possess contrasting personalities; Sinis is composed and tranquil, while Dex is rough and uncouth. Both twins are deeply loyal to Aki, but they share a mutual distaste for complex, meticulous tasks.