Sacchu is a mouse-class fairy assisting the Magical Five and allied magical girls, primarily operating with M-Squad. He delivers analytical support by linking magical girls' sensory data and evaluating enemy magic systems. Sacchu also engages in direct combat, wielding spiked brass knuckles as his primary weapon alongside firearms such as pistols and grenades; he employed these against Goblin-type Disas at Naha Air Base and during breaches at the JGSDF Naha Garrison's underground shelter. He punctuates every sentence with "chuu". His role includes coordinating magical girl operations through sensory sharing and battlefield analysis.