Sai

Sai is a character in BoBoiBoy Galaxy and a member of TAPOPS. He was one of the two Power Sphere Guardians in Planet Volcania.

“A Fiery Fight”
Sai debuts in this episode alongside his sister Shielda as Fang's teammate in Team A. They had been ordered to stop BoBoiBoy and friends from passing the Toughness Test and reaching their objective, which was to retrieve the Power Sphera on top of the volcano. He and Shielda relentlessly attack BoBoiBoy’s gang, eventually defeating all of them but BoBoiBoy. Set on fulfilling their orders, they prepare to defeat an already weakened BoBoiBoy, but are stopped by Fang. Sai and Shielda mock him for having sympathy for ‘weak’ Earthlings, provoking BoBoiBoy enough to activate his new elemental form, BoBoiBoy Fire. In the fight that followed, Sai continued fighting even as Shielda and Fang yielded. He unleashes his shield’s presumably most powerful attack on Fire, only to have Fire easily stop it and divert it back to him. Tarung saves Sai by catching the shield with his teeth, and is relieved when Tarung ends the Toughness Test. He is evacuated with the others when the volcano starts collapsing.

Upon arriving back at the TAPOPS station, he compliments BoBoiBoy’s outstanding combat skills in lieu of an apology.

“Phantom Thief Panto”
He cameos in this episode as he and the other two Team A members are stationed to guard Jokertu’s cell.

“Looping Loopa”
He cameos again when he is shown defending the TAPOPS Station alongside Fang and Shielda from Space Pirates.

"Pirate Armada Invasion"
He cameos along side with shielda waiting for BoBoiBoy and the others to arrive at sunnova station.

"Light of Hope"
He and Shielda almost had a big role while teaming up with BoBoiBoy and his friends on fighting Vargoba.

"BoBoiBoy Movie 2"
He and Shielda appears in the movie shown to be helping evacuate the Cendawa aliens. Sai is then seen piloting a spaceship to evacuate the residents of Planet Rimbara to safety while they are guarded by Shielda.

Physical Appearance
Sai's clothing consists of traditional attire similar to that of a ninja, showcasing a combination of yellow, green, black and red colours. His clothing is fortified with armor and metallic elements to ensure extensive protection, his waist features a red belt with edges made out of gold and a white emblem that further enhances its uniqueness. In addition, Sai dons his shield weapon in the form of an Asian conical hat, which affords him both defense and convenience. Both him and his twin have three dots on their cheeks which seem to be their birthmarks.

In BoBoiBoy Movie 2, him and his twin, Shielda undergo a change of attire, with their new clothes featuring less armor and metal. The reason for this change is possibly due to the constant use of magnet powers by their opponent, Captain Vargoba, which affects the metal content in their clothes.

Personality
Sai and his sister share the common trait of being serious, mature, and efficient people who are committed to fulfilling any orders given to them. Although they may face difficult situations, they persevere to the fullest strength in order to successfully accomplish their missions. However, Sai differs from his sister as he tends to act impulsively and does not take the time to carefully analyze the situation at hand. Despite this, Sai displays an immense amount of determination and refuses to accept defeat easily, especially during combat where he becomes highly passionate and intense. This was shown when he refused to give up despite being clearly overpowered by BoBoiBoy Fire.

Somehow, both twins seem like calm individuals.

Skills
In addition to being adept with his weapon, Sai, a skilled warrior, possesses not only an impressive combat ability but also a flexibility. He showcases his fluid movements by effortlessly jumping from elevated locations and skillfully evading incoming blows. His flexibility supplement his fighting skills, making him an intimidating opponent on the battlefield.

Abilities
His main weapon is a shield that he wears like an Asian conical hat. When thrown, it can strike and cut through any targets, and fly back to him like a boomerang. Using his finger, he can control his shield's movements and directions. He can command his shield to move in zigzag movements to make it more difficult for his opponents to predict its next location and dodge it.

When it hits the ground, it creates an explosion that can knock opponents off balance. He also uses it for defense, such as slicing up rocks flying towards him or to shield himself from attacks. Surprisingly, the shield moves fast enough to be unaffected by Ying's Time Manipulation when it enters her slow-mo field.

Maximum Spin seems to be Sai's most powerful skill as he uses it as a last resort in defeating BoBoiBoy Fire. However, even with the shield spinning in maximum speed, it can still be easily caught by BoBoiBoy Fire's bare hand, as well as Tarung's teeth, even after Fire enhanced it.

Trivia

 * His name "Sai" is the last three letters from the word "Perisai", that means "shield" in Malay, which is his main weapon.
 * Additionally, the name 'Sai' can also originate from the Japanese name '哉' (Sai) which means 'paint', though the Malay meaning makes more sense.
 * He shares a resemblance to the character Sae Itoshi from the manga/anime Blue Lock. Ironically their names are also alike and both are fond with sports.
 * In the BoBoiBoy Galaxy comic Vol. 3, he is revealed to be Shielda’s elder twin brother.
 * He and Shielda are well-respected by and good friends with BoBoiBoy’s gang, and often train with them and give them pointers.
 * He rooms with Fang in the TAPOPS station.
 * BoBoiBoy once bought Sai a Tok Aba Special Ice Cocoa drink, and according to him it was the best thing he had ever tasted.
 * Shielda has more physical strength than him.
 * He and Shielda aren't used to teaming up with anyone in TAPOPS other than Fang.
 * Sai's type of genre in music is rock.
 * Sai's hobby is playing sports.
 * Sai's favorite drink is iced milk coffee.
 * Sai's favorite food is noodles.
 * Sai's favorite color is green, like his sister does.
 * There was a plan to introduce Sai and Shielda's Power Sphera, that provided both the Shield and Hat. However there wasn't much reason to introduce this character into future episodes without forcing it.
 * In Sai and Shielda's early concepts, they were supposed to have blue hair.