Beelzebub

Ishiyama High is a school full of delinquents. Oga Tatsumi, nicknamed "Ogre," is known as the most powerful delinquent of all. Even the upperclassmen and students from other schools recognizes his strength. One day, while engaged in a fight, Oga spots a huge man drifting down a river. As he saves him, the man splits in half, and out comes a lively baby from his insides.

This baby is Kaiser de Emperana Beelzebub IV (Baby Beel), the son of the Great Demon King. He has been sent to Earth to destroy humanity. He immediately becomes attached to Oga, who possesses outrageously evil strength. That’s right – the most notorious delinquent was chosen to become the parent of a Demon King. Whenever Baby Beel cries and throws a fit, he ends up electrocuting Oga. After learning that Baby Beel becomes attached to strong and evil beings, Oga goes on a search for people who are more powerful than himself. But even then, he helps Baby Beel overcome his weakness and even goes with him to defeat other delinquents. Before you knew it, they were starting to look like a real family.

"Beelzebub" is a heartfelt parenting story featuring Oga Tatsumi and Baby Beel, as they laugh, cry, and fight; all the while maturing as a parent and a child.

Tatsumi Oga Oga 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 Devil King: strong, arrogant, and thinks nothing of his fellow man. In addition to the aforementioned attributes, Oga also seems to take pleasure in tormenting others, such as when he downright kidnapped 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 off. Oga and Beelzebub cannot be separated by more than 15 meters or else it may result in instant death for Oga, according to Hilda

Manga Online
TV Episode	Beelzebub D/L [Eng-Sub]
	Kaiser de Emperana Beelzebub IV Known as Beelzebub or Baby Beel. He is the youngest son of the Devil King. He is very attached to Oga, always clinging onto Oga’s back or sitting on Oga’s head. When he becomes agitated or sees blood, he’ll often throw a tantrum and will spontaneously electrocute anyone within his vicinity. Without Oga, he is physically weaker than even the average human child, but contact with Oga allows him to unleash his demonic powers.
	Beelzebub’s characteristic cry is "Daabū!" and he is always naked with a pacifier in his mouth. He, like Oga, is shown to anger easily, yet his outbursts are portrayed in a more comical fashion. He appears to like Aoi to a certain degree. Aside from her, he has also shown to have some liking to Toujou, who appears to remind him of Oga. When Oga reunites with Mikki, Beel showed immediate disgust and possible fear toward the Saint Ishiyama Student. The reason for this has not been stated.

Takayuki Furuichi Another first year at Ishiyama, Furuichi seems to be the only non-delinquent character of the story thus far, and even seems to have no fighting ability. He often points out the absurdities in Oga’s situation, acting as the rational and most passive member of the group. He is chronically cowardly, although he is quick to about face when a pretty girl is involved. Despite their obvious lack of similarities, Furuichi seems to be Oga’s only friend, and is often the one that Oga goes to for conversation. He is comically referred to as "idiot Furuichi" by Oga, and is often the victim of many jokes in the story, although he is shown to have a ruthless side to him as well, suggesting a different but no less evil commonality with Oga. Despite the nickname, Furuichi is shown to be highly strategic. For instance, using Beelzebub’s electricity to knock out a few opponents. It is also remarked that Furuichi’s grades would have easily gotten him into a high class school.

 

“[The story starts as he is telling the story of how he found the baby to his best (and only?) friend Furuichi Takayuki. One day while fishing by the river (actually, taking revenge on people trying to kill him in his sleep), he sees a man floating down it, he pulls him to shore,revealing a baby boy. This boy is the son of the demon king and he has been chosen as the one to raise it with the baby's maid Hilda. The story follows his life with the child and at the delinquent school. The early chapters of the manga follow Oga as he attempts to 'pass on' Baby Beel to other students at Ishiyama, (The theory is that if Oga can find someone more evil and stronger than him, Baby Beel will attach to that person instead of Oga). After subsequently fighting and defeating all members of the Tōhōshinki and in the process, destroying Ishiyama High itself, Oga and company are transferred to Saint Ishiyama Academy, which appears to be a direct opposite of the delinquent school.]”

Source wikipedia