Hope Mikaelson

Niklaus and Hayley's Unborn Baby was mentioned in The Originals.

This baby will be a member of the Mikaelson Family.

Biography
The baby was conceived in the episode Bring It On'''. '''

It is unknown if the baby will be a hybrid (human, vampire, werewolf, possible witch hybrid - due to his/her heritage with Klaus's mother Esther a witch), but Niklaus' werewolf side was the side that conceived the child. Hinting that the baby will be a werewolf.

Season 4
"Every king needs an heir."

- Klaus changes his opinion about the baby.

In the episode The Originals, The witch Sophie revealed that the werewolf Hayley was in fact pregnant with Klaus' child. She revealed that the baby is one of natures so called "loopholes". She later revealed that it was because of Klaus' wolf half that it was conceived. Sophie then demands that Klaus helps her or she will kill the baby and its mother.

Niklaus initially had no interest with having anything to do with the child, even telling to the Witches that they made a mistake if they thought they could get to him by using Hayley and their child as leverage. But after words of consideration from Elijah, and a few exchange from Camille ( the brave bartender ), he later changes his mind. When Elijah asked him about Hayley and their unborn child, Klaus replied him that "every king needs an heir".

The Originals
In Always and Forever, Elijah tells Sophie that he believes this child will be a way for him to finally be happy. Sophie is glad he feels that way, supporting the child as she blackmails him. If he gets Klaus to co-operate with their demands, since Marcel already drove the werewolves from the French Quarter, nobody will have to know of the existence of a hybrid baby. In a later phone conversation with Rebekah, Elijah swears he will not let anything happen to the baby.

When Rebekah arrives in New Orleans looking for Elijah, she meets Hayley, commenting her "supernatural, miracle baby bump" isn't showing. After a short conversation with Niklaus about the whereabouts of their elder brother, Rebekah takes Hayley to the basement of their house, showing her the coffins, before warning her to get out of New Orleans while she can, because one the baby is born, Niklaus will be "planning a coffin for her". Hayley comments that the witches cast a spell, if she leaves New Orleans, she and the baby will die.

Rebekah's words clearly affecting her, Hayley heads to Jardin Gris, inquiring wolfsbane in an attempt to abort the baby. She sits on a bench at night, pouring the poison into a cup of tea, urging herself to drink it. She is about to drink when she hears rustling behind her. Vampires appear in front of her, saying wolves aren't welcome. Hayley, fed up of being told what to do by vampires, tosses the cup at him and attempts to flee. Rebekah suddenly shows up, ripping the heart out of one of the vampire's, and snapping the neck of the other, saving Hayley's life. After Klaus hears of Hayley leaving the house, he berates her and demands to know what she was doing. In a rage, Hayley growls she wanted to put the baby out of it's misery, a comment which Klaus begins to choke her over, showing he clearly cares for the baby.

The day after, Klaus slowly walks into Hayley's room whilst she is supposedly sleeping, he notices the bottle of wolfsbane and sniffs the top. Hayley then tells him she didn't use it, Klaus asks her why as she could've been free from "all of this". Hayley says that when she was being attacked, she wasn't just protecting herself, she was protecting her child and she didn't want to let anyone hurt it.

In Tangled Up In Blue, Hayley is walking by the pool at night, and she suddenly looks up to see herself face to face with a wolf. Sabine suddenly appears and tells her that the wolf is drawn to her, because of the baby before telling her that she knows some charms in which can reveal the baby's gender. Later on, Hayley is lying on a kitchen table with Sabine dangling a pendant over her stomach. She tells her she thinks it's a girl before suddenly stopping, Hayley says "don't tell me I'm having a mini-Klaus" before Sabine drops the pendant and gasps, repeating the same sentence leaving Hayley confused at her words. Some time later, Klaus walks into the room whilst Hayley is seated on her laptop, and she reveals she thinks their child is a girl, unseen to her, Klaus smiles at the news. As he leaves, Hayley is seen typing the sentence Sabine repeated onto her laptop.

Trivia

 * Like its father, the baby could be the first of a new species.
 * Sophie describes the baby as "one of nature's loopholes" in The Originals.
 * Elijah believes Klaus' child is the key in reuniting his family.
 * The child was able to heal Hayley from her injuries sustained in Girl in New Orleans.