Hilda

, or for short, is a demon that serves as the baby demons maid.

Personality
Hilda commonly displays a cold and impassive demeanor, a character trait that she breaks only on rare occasions. (excluding her interactions with Beel). Toward Beel she is very affectionate and protective, acting as the role of the mother and preforming the task a mother would such as cooking and washing Beel. She often knowns more about the current situation then any of the other protagonists and is easily able to manipulate the others into doing what she sees best.

She is shown to be just as bloodthirsty and violent at Oga, a trait that earned her the nickname "Oga Bride" at Ishiyama. In a fight she displays a complete confidence in her own skill and power, regarding her opponents calmly and often taunting them in mid battle.

She enjoys teasing and tormenting Oga, frequently making marks about his intelligence and (in her own mind) poor parenting skills. In the beggining of the series she is openly dissaproving of Oga as Beels parent but after the delinquent defeats Toujou she becomes much more accepting and warmer towards him, even thanking him after.

Appearance
Hildegarda is depicted as blonde with green eyes, and is well endowed. Her clothes are mostly black with white quillings and thus resemble Lolita Fashion. She is seen outside this outfit on only rare occasions. One occasion being right after she wakes up, wearing a modest night gown with her hair down. Another being when she infiltrates Oga's school, dressing in the normal school's uniform, though she complains that the shirt is "a little tight."

Story
Hilda originally came to the human world by command of the Demon King to raise his son, Kaiser de Emperana Beelzebub IV, to be a 'good' human destroyer. Beelzebub however got so attached to Oga Tatsumi, that she now observes him and his progress in being the future demon king's parent.

Power
Her main weapon is a swordstick-like umbrella again fitting her victorian era theme. However she rarely draws the sword, especially against weak opponents she refuses to do so.

It can be assumed that she is currently the most powerful of the series protagonists. She is able to easily draw out her demonic powers, something that other than her, only Oga possesses. It is unkown how her demon power compares to Oga, but as Oga cannot control the power well it can still be assummed that she is stronger.

Conveyance
Despite the fact that she is naturally just as fast as strong she is as a demon, Hildegarda rides a giant bird-like being named Ak-Baba