"You really want me to beat you up?""
Takeru Oyama (大山 タケル Oyama Takeru) is a member of the Student Council Security Division, a freshman student at Tenbi Academy, and the central protagonist of the Maken-Ki series. He is the child of Takeshi Oyama and Atsuma Oyama, descendant of Oousu no Mikoto and Yabiko Oyama, and very distantly related to Kodama Himegami.
Takeru originally enters Tenbi Academy without any knowledge of the school, other than that the school had changed from all-girls to co-ed. Before moving to Tenbi, he was at an all-boys school. His best friend is Kengo Usui. He currently lives with Haruko Amaya,
Takeru is a teenager with brown hair that is shaved close on the sides and forms a crown in the back. He originally wore glasses, and presumably still needs them, but has stopped wearing them as "they kept getting broken too often". His usual attire is the Tenbi Academy male student uniform which consists of a white shirt, green tie, blue pants, and black shoes.
Takeru is a helpful and kind person, but has a perverted mind. Although he doesn't really mean to do these perverted things on purpose to Haruko he still gets beat upon her. He never thinks before he acts, as described by Haruko. He never wanted to see women fight, or to fight women, when his mother Atsuma died after she lost a duel; and considers his father the one responsible for her death, despite her dying from a disease.
After encountering Tesshin during the Summer Camp arc, Takeru has since changed his opinion of fighting women, recognising it as his own weakness and refusal to face his past. He has also apparently forgiven Tesshin and his father, realising that they were not at fault for Atsuma's death.
Takeru met Inaho on one of her father's trips to the city, making a strong impression on her.
After his mother's death, Takeru left home and lived alone until his enrollment at Tenbi. He didn't recognise Inaho immediately due to their youth and the fact that they lived together for only a brief period.
Welcome to Tenbi
In the beginning, he dreamt of a mysterious person which is most likely Blood Pointer's true form. That mysterious person said that it's too early for Takeru to be his master, but "it seems you have already awakened".
Upon arriving at Tenbi and heading for the opening ceremony, he comes across two girls duelling. While he wonders at what's happening, he notices Kodama Himegami hanging upside down from a tree branch. Takeru comments to her he can see her underwear, and she falls out of the tree on top of him. Somehow in the fall they end up kissing, and a symbol appears on Takeru's chest, which Kodama sees but Takeru is unaware of. Kodama immediately states that he's her mortal enemy, and challenges him to a duel at the welcoming ceremony. She tries to use a time-delay electric attack that will kill him after a few days, but she is stopped when Inaho appears and blocks her attack.
Date with Takeru
Life at Tenbi
Clash with Venus
Summer Training Camp
When Takeru falls into the cave, he encounters Tesshin, who questions him on his reason for coming. When Takeru attempts to attack him, Tesshin makes a fist and punches Takeru away with his fist's air pressure. Takeru screams that Tesshin killed his mother, leading to Tesshin realising that Takeru is Atsuma's child. Tesshin accepts the accusation, and claims he and Takeru are sworn enemies, and calls for a fight. Tesshin and Takeru begin to fight, although Tesshin fights with his eyes closed. Tesshin, noting Takeru's good instincts, begins to command him about how to fight while they do so. However, Takeru's fear over Tesshin's right fist begins to overwhelm him, disappointing Tesshin, who tells him to leave. Takeru then considers himself, and realises that his hatred for Tesshin and his father, along with his conviction against fighting women (himself or others), was simply his own weakness and refusal to face his mother's death.
With new courage, he rushes Tesshin, who gets excited as Takeru's eyes are now just like Atsuma's. As Tesshin punches Takeru, Takeru leans back to the point of breaking his own back to avoid the punch, shocking Tesshin. He then bites Tesshin and uses Tesshin's Element to heal himself. After Takeru lands a massive punch, Tesshin realises that Takeru is using Blood Pointer, and tells him about Blood Pointer's ability to take people's emotions, good and bad, and turn them into Element. He thanks Takeru for showing him how to use Blood Pointer, while Takeru tells him that Tesshin has also helped him to understand something about himself. Takeru later wakes up on Tesshin's back, having lost the fight. Tesshin is carrying him out of the cave, which was collapsing due to their fight. He reveals that Inaho is his daughter, much to Takeru's shock, who points out that they have nothing in common physically.
Overblow - Takeru's maken causes his opponent's maken to gain incredible power and overflow with element causing it to go out of control and force the user to be unable to use it. The downside to this maken is if his opponent is able to contain the overflow of element or has perfect control over his/her maken, it would only provide his opponent greater power or even make the maken evolve into something greater. His attack with this maken is Drive Duo, and Blood Duo. However, this is described as a side effect by Gen, and the true power of Overblow lies in the ability to erase dark/evil element.
Blood Pointer (Buraddo Pointaa) - Takeru's hidden ability, this ability allows the user to drain elements from their environment through their mouth, increasing their strength and healing them if necessary. It weakens the people who the user drained the element from. It is unknown how easily it can interrupted; the only person to interrupt an berserk Blood Pointer was Kengo Usui, who had the Element Canceller ability. As Element is needed for life, as well as attacks and manifesting maken, it is quite possible that a berserk Blood Pointer would be unstoppable without a long-range attack or a user with a near-infinite amount of Element.
Fist Blade - A technique used by Takeru after using his Blood Pointer ability. This element is built up in his hand and fired at the enemy as a huge blade of element.
Absolute Fist - a charged punch delivered while Takeru is moving at high speed.
Haruko is Takeru's childhood friend, and from the beginning of the storyline he addressed her as Haru-nee, implying he sees her as an older sister. He is protective of her, but usually ends up being scolded or beaten by her for the perverted situations he ends up in. He seems somewhat resigned to her constant beatings, never really challenging her on them.
Inaho and Takeru are old friends, though have not seen each other for 10 years. When she was saying goodbye to him as a child, he promised her to be together forever, which led to her falling in love with him. However, he tells her he does not see her romantically when she confesses to him. Despite this, he still considered her to be a extremely close friend.
Takeru and Kengo are partners-in-crime; they first meet and bond while attempting to spy into the girls changing room. As the only male members of Maken-Ki, they tend to suffer together, and seem equally perverted.
Takeru was on bad terms with his father after his mother died, running away from home and going to into a rage upon learning that it was his father that sent Inaho to Tenbi. However, he has since reconsidered his relationship with his father, and wishes to reconcile with him.
Upon their reunion, he claims the reason he didn't want to return home was because the loving overreaction by his father upon seeing him again. He also considers his father a perverted old man (ironic, given his own behaviour).
As a result of his training, Takeru has become quite similar to his mentor in that they both get constantly scolded for their actions. They are also quite close, although some of Minori's rewards (i.e. chances to fondle her) completely deprive him of motivation.
For the 10 years between his mother's death and the main storyline, Takeru harbored a deep hatred of Tesshin, blaming him for his mother's death. However, after his encounter with Tesshin during the Summer Camp arc and Tesshin's actions, he realises his hatred was his own weakness, and comes to respect Tesshin. He tells Inaho that he is deeply grateful to her father, saying he received many beatings, but they really saved him.