It should be noted that despite his delinquent nature, Youjirou has no fear of his son, rather Oga will get scared of him if when he's mad, due to him gaining a volatile personality. He eventually developed a fever afterward. It is also hinted that he disapproves of underage smoking and drinking. [101] Though initially confused, he is then told more about Takamiya's past,[102] which includes the name of his Demon, Lucifer. One morning, he and his family sit down for breakfast. After having a rough time, they use Beel to feint and won the game, but after their victory, the school is attacked by one of Oga's old enemies.
Oga becomes angered after Furuichi punches him in the face. Oga penetrates the shield, doing more damage to himself. The child-rearing gang leader subsequently tells Baby Beel that he will demonstrate how to make friends, before Oga then punches the attacking delinquent, easily sending the latter flying several meters away. Irritated, Oga tells Furuichi that he needs to face the consequences and kicks him as he runs away. Oga's light-hearted attitude quickly disappears after Kanzaki leaves to challenge the Poltergeists; before he does, he tells Oga that he is no one's vassal, and that Oga can deal with Nasu alone.

[49] Himekawa elaborates further on the three first-years and adds that Oga might not even care about what he is saying; after that, he leaves. The TV anime premiered on January 9, 2011 on Yomiuri TV and other NNS stations and ended on March 25, 2012. Afterwards, he is kicked away to the damaged metallic fence bordering the rooftop where he is then struck with a massive amount of Demonic energy, collapsing moments later; Takamiya, however, holds him by the head before he can fall flat on the ground. Oga met Miki when Miki was getting beaten up by thugs until Oga came by and rescued him. Oga and Hilda's next challenge was to fight against Oga's teachers, Zenjurou Saotome and Suiten Ikaruga. Oga looks on as both of the delinquents walk away from him. A group of boys then asked Furuichi to play dodgeball with them.

In the early chapters, he attempts to 'pass on' Beel to other students at Ishiyama, thinking that if he can find someone stronger and more evil than himself, the baby will attach himself to that person instead. As it turns out, rather than a Zebul Spell, on Kanzaki's back is truly the King's Crest, which signifies that a lifelong alliance has been made between the two teenagers; upon hearing this, Oga becomes surprisingly excited and starts to gloat over this apparent achievement.[66]. Later, Naga and Graphel, the other two demons who came to the world in search of Oga, appear before Saotome, but Saotome uses his Spellmaster spell to attack them. However, Oga simply stated that the shock he received from the rod was nothing compared to Beel's tantrums.

Oga remarks that he learned too much about the particular Spell from Saotome and threatens to force answers out of Nasu's mouth with brutal force.

[72] Oga tells a now-bloodied Nasu to stand up and discover that his initial words about dominance are meaningless; however, he is instead called out as a "cheater", then inquired about the supposed "Father Switch". However, there was one St. Ishiyama student, Kazuya Yamamura, who admired the delinquents, especially Oga and Furuichi as he thought that they both defeated the Touhoushinki when in fact it was only Tatsumi Oga that defeated the Touhoushinki. Leaving Kanzaki's men completely shocked, Oga leaves the area feeling rather disappointed. Oga still believed in Santa Claus during his toddler years. After the arrival of the entire 34th Pillar Division, Oga would train under Suiten Ikaruga in Black Techs to utilize Beel's demon powers. Oga concluded that the power he had was enough to draw Beel towards him. Beel is completely focused on the conversation at hand, and he remained quiet through most of their conversation. His logic was that "strong men" were most appealing to Beel, and that the most malicious of characters would satisfy his needs. [85], Not long after this, Oga watches as a King's Crest bestows itself upon Aoi's chest, alarming him. When Ringo speaks to him, he tells her to stop. Hilda, not knowing how to play, gets the wrong cards - allowing Shizuka to easily win for Toujou to attack Oga. [84] Aoi is then given an ultimatum where she is told to fight either Oga or Nene for the other one's safety; such a demand shakes her up and she finds herself unable to rise. The unusual hawk suddenly snatches Baby Beel from Oga and begins flying away from the teenager; surprised, Oga begins calling out for the Demon Lord. Beelzebub Long Novel: BeelBeel☆Saiyūki, The Demon Lord Becomes the Monkey King, Beelzebub Long Novel 2: BeelBeel☆TimeTravel, Baby Beel Takes Time, https://beelzebub.fandom.com/wiki/Tatsumi_Oga?oldid=29730. Their fight was only a means of testing Oga's power, and as such, the subordinate left without any signs of anger or tiredness, a statistic Oga picked up on well. Oga claimed that he did not know anything about this. [132] Unconscious, Oga fails to sense Baby Beel come for him shortly after.[133].

[57][58] As Oga reflects on Nasu's words, suddenly, Baby Beel begins pulling on his hair and effectively tormenting him; this causes Oga to yell at Baby Beel, as well as Furuichi, when the latter casually interprets a reason as to why.

The delinquents surrounding them awaiting to watch the two fight were all shocked as well. It should be noted that the two work extremely well together in a fight. Oga becomes comically outraged at the apparent scam and demands a refund. While preventing Baby Beel and Kōta from fighting each other, he reveals his presence to Aoi, unintentionally startling her[60] and resulting in a slap to his face.[61]. Even so, Oga remains confident in himself.[76]. [53][54], Despite so, he can hear the conversations being held in the hallways, and eventually he becomes annoyed. Falling helplessly on the road, baby Be'el was about to cry until Oga stopped him, saying that Hilda was still watching over him. He calls the skill "Super Milk Time", which was invented accidentally during his training with Zenjuro.
Both pairs start to move at the same time, Aoi gets pushed back by Hilda using her left eye since she sees too well with it (Aoi tought it is a blind spot). Afterwards, Oga lies nearly unconscious on the ground being forced to listen to more of Nasu's speeches.[71]. Before Nasu leaves, he warns Oga that his gang will take down everyone who came back from Saint Ishiyama Academy, as well as that he will steal Baby Beel from him. After being rescued by Saotome, Oga reluctantly trained under him in the demon arts and after a week the delinquent would expertly use the same technique that Saotome used to drive the Pillar Division demons away.

Another example of Oga paying attention is when Saotome was lecturing him about using Super Milk Time for no more than 5 minutes. Once Oga gets home, he is in a surprise to find Hilda there waiting for him, with a strange demon doctor known as Dr. Furucas, and his assistant, Lamia. [32], Suddenly, they are approached by the members of the Shadow Force who appear ready to get their revenge on Oga. Though he doesn't know it yet, this baby is named Kaiser de Emperana Beelzebub IV, or "Baby Beel" for short—the son of the Demon Lord! Furuichi is worried about Oga's status among the students at Ishiyama High. Oga notices that Baby Beel has won the game. Hilda does manage to get a card, but the card had a useless move. The Elder Scrolls metaphysics & philosophy. While they did, Oga said, "If you want to come back, then punch the lights out of that Demon Lord and come back on your own." Hilda realizes that he had "forced a synchro", or synchronised himself and Baby Be'el. The ghost-like creature turned out to be the demon doctor, a physician that is in Muumuu form, whom Hilda called to assist with the examination of Oga and Beel. The two break off in yet another argument, however Beel calms down, explaining (somehow) that the star Oga and Hilda had worked together to get was the best Christmas present ever. It is also shown that he is afraid of insects. Kanzaki and Hajime fend off two opponents each and were dumbfounded to notice Oga handling the rest on his own. He possesses brown hair and dark eyes, he is rather muscular with a widespread build, and his attire usually consists of a worn-out shirt, his brown leather jacket, and plain pants (usually jeans). Another example of Oga paying attention is when Saotome was lecturing Oga about using Super Milk Time for 5 minutes max.