Sai

Sai was one of the two Power Sphere Guardians in Volcania before being defeated by BoBoiBoy and being evacuated to TAPOPS Space Station.

Abilities
His main weapon is a shield that shapes like an Asian conical hat, and he wears it on top of his head. Using his finger, he can control his shield's movements and directions. When he throws it, it can hit and cut any targets, and fly back to him like a boomerang. He can command his shield to move in zig zag movements to make it more difficult for his opponents to predict its exact movements.

When it hits the ground, it creates an explosion that can knock opponents off. He also uses it for defence, such as cutting rocks flying towards him or to shield off attacks. Surprisingly, the shield is unaffected by Ying's Time Manipulation when it enters the slow-mo field created by Ying.

Maximum Spin seems to be Sai's most powerful skill as he uses it in the last resort in an attempt to defeat BoBoiBoy Fire. However, even with the shield spinning in maximum speed, it can still be caught and stop by BoBoiBoy Fire's hand and Tarung's teeth.

Trivia

 * His name "Sai" is the last three letters from the word "Perisai", which means "shield" in Malay, which is also his weapon.