Sizuku is extremely forgetful. If she forgets something, she will never remember it no matter how others may try to remind her. She can be an airhead at times which, along with her unassuming appearance, can cause her opponents to underestimate her combat abilities. Sizuku used her her vacuum deme-chan in combat and cleaning the area of the battle just like sucking the dead bodies. Sizuku is also left-handed, and the twelfth physically strongest out of the 13 members of the Troupe.
Source from Wikipeida