Tatsumi Oga

is the main protagonist in the manga Beelzebub.

Tatsumi is first introduced as a strong fighter, beating up some fellow class mates and then making them bow down to him because they had attacked him in his sleep. It is revealed that he is relaying the story of a series of strange events which leads to him becoming the Earthly father of the son of the devil, Beelzebub IV. He was picked to become Beelzebub's father because he possessed the qualities of the ideal parent for the future Demon Lord: strong, arrogant, and thinks-nothing-of-fellow-man. In addition to the aformentioned attributes, Oga also seems to take pleasure in tormenting others, such as downright kidnapping Furuichi from a 5-star resort in order to go with him to the public pool, stating that he did so mainly to piss him of. Oga and Beelzebub cannot be separated by more than 15 meters or else it may result in instant death for Oga, according to Hilda [2] (as of chapter 38, the distance has increased with 8 centimeters). A tattoo-like contract on Oga's right hand, which grows larger the more he fights, signifies the contract between Beelzebub and him. The contract allows Oga to access large amounts of demonic power.[3] Thus, Oga tries to stop fighting to limit the powers which will ultimately be used to end the human race. He seems to have a lot of enemies and makes even more as the series progresses (despite trying not to fight). He also seems to have no friends except for his classmate, Furuichi. He lives with his parents and sister, though Hilda and Beelzebub have recently moved into his house. He is currently a first year at Ishiyama High School. Surprisingly, Oga is a decent father figure to Beelzebub. Oga seems to be stronger than the average human, as Hilda said being exposed to the amount of demonic power he took would drive a normal person insane.[4] Recently he has been thrown out of his house by his sister until he finds Hilda and apologizes to her and bring her back. He has been confronted by Toujou, who had baby Beel with him, and said "let's fight" to Oga. The fight seemed to go in Oga's favor until Toujou sent him flying into the river. He returns home and is confronted with Hilda who tells him that she would support him in order to get baby Beel back. After repairing his link with Beel, Oga goes to the school to defeat Toujou and get baby Beel back. Baby Beel turns back to normal when he sees Oga. Oga tells him not to interfere with his fight, and after a long battle he defeats Toujou. After that he accidentally destroys the school because of backup power from Beel.

Appearance
Oga is usually seen sporting a grosteque grin and his demonic features are visbly shown when he is either angry or distrubed. He posesses brown hair and dark eyes, he is rather muscular with a wide-spread build, and his attire usually consists of a worn-out shirt and plain pants (usually jeans). He has been shown on a few ocassions to be wearing either sweatpants, and on one ocassion, has even been shown wearing his pijamas (ironically very detailed with pinstripes going down the side). When Oga attempts to smile, he is usually seen with a demonic, evil grin. This speaks to his lack of social skills (due to his ihibition in a juvenile highschool).

When fighting Oga appears to have a different look. Aside from his rare comedic entrances (usually relief from an intense situation), he is usually very calm and actually quite aware. His eyes are alert and he seems in control of his emotions. Be'el does not transfer this emotion however, and is usually shown in a maintained angry look.

Personality
Oga was shown in the series pilot as nothing more than a dangerous, crude, and at times unnerved teen. A first year student at Ishiyama High School, he is known as the "Violent Ogre".

Ishiyama High
The series began in a lightened fation (common with most shonen mangas including Katekyo Hitman Reborn and One piece). Oga was introduced destroying armed mercenaries and local thugs. As they pleaded for mercy Oga fought them alone and with an offscreen tilt he was shown to have battled them rigorously. Many were uncontious and although it seemed the series was unfolding in an event-themed fation, it was shown that it was really Oga's retelling of what transpired to Furuichi Takayuki. His story continued and he explained how a large man came floating upstream (the local riverside) and he eventually cracked open, revealing a small baby. Furuichi is shocked by Oga's lack at story telling abilities (although the retelling was revealed to be true), and the two continue in loud voices. Be'el is completely focused on the conversation at hand and he remained quite for the most part of their conversation. Oga continues his rant on the Be'el situation and reveals that he must take care of the demon baby, because the child is so attached to Oga's raw abilities. HIlda is mentioned and referenced during his conversation and Furuichi is quite taken by her.

The next day, Oga takes Be'el to school with him. Furuichi wonders out loud why he would go to that much trouble for the kid. The strory continues with Hajime Kanzaki's mercenary forces coming in contact with Oga. Furuichi is worried about Oga's status among the students at Ishiyama High. The students are convinced Oga is the father of Be'el and are shocked by their self-perscribed qualifications. Oga becomes aware of Hajime Kanzaki's status as among the four Tohoshinki. Being the somewhat sadistic and irresponsible teen that his, Oga seeks out Kansaki in an attempt to foist Be'el on him. His logic was that "strong men" were most appealing to Be'el, and that the most malicious of characters would satisfy his needs. When the two meet, the discusion takes a dangerous turn as Kanzaki send one of his own men flying with a direct attack(after annoying him). After witnessing this degrading presentation, Oga himself disgusted found it impossible for him to take Be'el, and in retalliation sent Kanzaki flying himself. Kanzaki's men completely shocked, oga leaves the area feeling rather dissapointed.

The next step for Oga was handelling the other menacing forces of Ishiyama. The second step was Tatsuya Himekawa, another thug who uses his money and influences to gain dominance. He was approached by Kanzaki and easily took care of him and afterwards Himekawa went to handle Oga directly. He kidnapped Furuichi and Hilda (both were seen with severe burns). Oga was flooded from head to toe in his room, and was immediately disgruntled. He went to the warehouse where Himekawa had the two held. He blasted through his thugs (reinforcement), and made his way to Himekawa. However, Himekawa turned out to be a more competent opponent than Kanzaki. His weapon was a stung rod and with fluid movements he had Oga on the ropes momentarily. With Be'els help Oga was able to defend himself and send Himekawa flying due to his magically augmented arm. Himekawa was shown in the hospital afterwards, with a bitter feeling about Oga.

After defeating two of the Tohoshinki, Oga claimed somewhat of a celebrity status among the students. Although he did not seem any more out of the ordinary, he was commented on by many of the juveniles that pollute the school. Oga takes Be'el to the park as what he calls his park debut. There he meets a young girl wearing glasses and a stroller. Oga attempts to become friendlier as he does not want to be thought as cruel or uncaring. He sits near the girl and strikes up a conversation, the girl was not revealed until later as one of the four Tohoshinki, the leader of the feminine group Aoi Kunieda. Although she wears a disguise at the park, perhaps as a means to protect her reputation, Oga is completely oblivious when the two square off. He is unable to identify her although it appears as though Be'el was able to make the distinction less apparent. Aoi was the one looking for Oga as he was said to be "breaking a difficult and dangerous balance", an allusion to his complete destruction of both Kanzaki and Himekawa. Aoi quickly proves herself to be a competent fighter, with rapid speed and a clear understanding of martial arts. She wields a wooden sword, and although not an actual sword, she yields the same results as though it were metallic slicing the window barrings and their reinforcements. Oga is quick to the challenge and avoids fighting her. Aoi is shocked to see that Oga is carrying a child, and as such is thrown completely off guard by him asking her to become Be'els mother. Although it was merely his means to ditch the child, Aoi took this as more of an invitation to become his partner, and as such, she became infatuated with him even developping a crush along the way.

Oga's troubled road through Ishyama continued when the last and final Tohoshinki was revealed. Oga left his house after Be'el showed signs of their severed bonds. He was launched out of his window after showing a hurt and emotional Hilda his theory of leaving Be'el. Although he was only referring to the electric shocks, HIlda smashed him through the window and ordered him to leave. While walking through the park, Oga was attacked by Tojo's top fighter in an alley-way. Their fight was only a means of testing Oga's power, and as such, the subbordiante left without any signs of anger or tiredness, a statistic Oga picked up on well. A confused Oga wondered about the thw relation the two shared. The subbordiante answered calmly and then exited teh alley-way, missing his next hit on Oga (which was sure to be a devastating blow).

When Oga awoke the next morning he noticed baby Be'el was missing and Hilda was once again absent. Furuichi pondered this and spoke openly on why Oga was taking the situation to lightly. A jubilant Oga was cut short on his celebrations, and was forced to go search for the two by his estranged sister. Oga went to look by the river-bed as that was where he first found Be'el. Tojo and his subbordinate were there, and Be'el was also present, this time riding on the back of Tojo. A fight ensued, and with that Oga began to notice issues with Be'el. HIs galzed eyes were unfocused and the attachment to Tojo was almost abnormal. Oga concluded that the power he ahd was enough to draw Be'el towards him. Oga demanded to know how he found Be'el in the first place. Tojo answered honestly that he found Be'el roaming the streets. He tehn took a few jabs at Oga's terrible parenting skills. Be'el was set to be the prize of the fight, and Oga was quickly beat to the point where he succumed to serious injuries. Oga took the upper hand, catching him of guard until he noticed the zebub spell's contract on Tojo's arm. Tojo sent Oga flying and afterwards took Be'el and left the scene. Oga returned home, bitter and angry, to find Hilda and a ghost like creature in his stairway.

Fighting Style
Oga even before meeting Baby Be'el has only used his fists to fight. Using street fighting techniques and his already inhuman strength to win fights. He also knows a lot of wrestling moves like, "German Suplex" and "Boston Crab." Now that Beelzebub is with him his strength further enhanced with demonic energy. Oga likes to make up crazy names for his attacks even though they're still only regular moves.

Attacks:
 * Zebub Blast - Oga punches his opponent and releases a large amount of demonic energy that's strong enough to destroy a building.
 * Street Fighter Techniques - psycho crusher, shoryuken, yoga chop
 * Finishing Moves - Super Rocket Punch(regular punch)

Quotes
"Men are fighting spirit"