Manabu Saien or the Chief (Kenny in the English dub) is the technical member of the Bladebreakers team from the anime series Beyblade. Between fixing beyblades, doing upgrades and keeping track of all the latest stats for beys, he's a very vital part of the team. His main interest is in studying beyblades and finding ways to improve them rather then battling. Later in the series, his real name is revealed and his mother is the only one to say it. Although his real name is Manabu Saien (Kenny in the English dub) all his friends call him the Chief. Only a few people in the anime have called him by his real name such as his parents or Blader DJ in a few episodes.
Manabu is the "brains" of the Bladebreakers team. He is a "self-described nerd", as he'd gladly take the job of a janitor just to be around high-class instruments and computers. He is nicknamed the "Chief" by his fellow beybladers because of his advanced expertise on beyblading and computer technology.
Manabu's parents, introduced in the second season, own a noodle shop - one of the most successful in the city - and live right above it. His mother is shown to be pushy and overbearing, constantly badgering Manabu about not being enough help to their business and demanding that he help more with the shop. Manabu's father is more easygoing but is constantly busy with the running of the shop; he is never seen outside of it.
Manabu created the Hard Metal Beyblades with some help from Miguel and Emily., and is shown to be of genius intelligence as demonstrated in his ability to repair and modify beyblades to the best of their potential. This was, for the first two seasons, the sole reason for his involvement in the Bladebreakers team - but in G-Revolution, Manabu begins to come into his own as a blader, and becomes an official competing member of the team upon the departure of Max, Kai and Rei from the Bladebreakers.
Manabu first appears in Akira's beyblading place where there are other kids there as well. There was going to be a beybattle between Takao and Akira but it got canceled when a boy named Hiruta from the Blade Sharks shows up. After Hiruta left, Manabu introduced himself to Takao and showed his laptop to him. Takao is furious because this Hiruta guy is taking advantage of other bladers and taking their beyblades if they lose to him. Manabu finds out that the reason why Hiruta is winning so easily is because his beyblade is much heavier then everyone else's. Manabu then tells Takao they need to work on a beyblade that can go four times faster. So with Manabu's help and Takao's unique launching abilities, Takao manages to beat Hiruta and get everyone's beyblades back. After that, both Manabu and Takao became the best of friends ever since. When Max showed up, Manabu was jealous of him because he thought that Takao would forget about him now that he made a new friend, but that soon turned out not to be true; the three became good friends.
He does not beyblade much, he prefers to be a beyblade researcher knowing parts and using his computer database (referred to as "Dizzy" his bit beast in the American release) to find stats on parts during beybattles.
He only Beybattled twice in season 1, towards the end of season 1 in episode 45 along with the Blade Breaker's face off against Kai at Lake Baikal however, he does not last long in battle.
He also beybattled in the beginning of season 1 episode 4 in order to try and win a qualifier match with Kai. He however lost lost against Kai who crushed him. Manabu's`s blade "Jumping Base" in season 1 had a huge spring on his blade just makes it jump constantly which he believed would prevent his attack ring from being hit.
In this season of Beyblade, his parents are finally seen. His mother refers to him as Manabu rather then the "Chief" but his mother calls him that because obviously he is her son. In his room he has a bed that has a blanket with the words CPU written all over it. After Takao's beyblade gets an upgrade, Manabu challenges him to a battle. At first Takao rejects, seeing it as an insult to his blade. Soon, Manabu starts to make fun of Takao saying "your just scared your going to lose to me" he then accepts and the two battle. Manabuappears to have the advantage due to his beyblade literally hopping all over the place, so that when Takao tries to hit it with his bey it instead slams into trees and rocks. At one point in the battle, his Beyblade hops onto a rock in the middle of a pound and is about to attack but as it is about to move in falls back in the pound sinking into the water with the BB still jumping slightly.
Beyblade: G Revolution
Kenny updates his Einstein beyblade during the Beyblade 2003 Tag Team qualifier. Sometimes in battle he calls his blade "Hopper" when he updated his blade he used a small spring which makes it not hop constantly. It makes it spin to run from a opponent and when the opponents blade comes to attack Manabu's blade automatically hops to avoid it. Manabu battled Yuri Ivanov in this season and proves to be very strong-he is able to actually push him back and Tala is seen wondering whether Kenny can beat him.
- Jumping Base- Hop Attack
- Einstein Attack-Frog Splash: First used in Episode 05 (Beyblade: G Revolution) against the copy bloader. Kotaro.
- Einstein MS
- Although Manabu is not a Beyblader, the few times he does blade is against very tough opponents, against whom he managed to put up a fight.
- Manabu is shown to like Mao, Emily, Hiromi and Ming-Ming - especially Ming-Ming