Backstory

So According to them the history of Mikaelsons goes like this First they were Vikings due to plague had to fled that place and with the help of Esther's friend Ayana bennet they settled in this new village which Will eventually be named Mystic Falls .

Esther had a total of 7 children the oldest Freya died of plague , Finn, Elijah, Niklaus , Kol , Rebekah and the sacrificial lamb Henrik on ehose death by the wolves triggered the whole story .

Their father forced Esther to cast a spell to protect them To be stronger than Wolves who killed Henrik . If wolves were fast they had to be faster , Stronger than them , If they bite they have to bite harder so Esther got her hands on a Incomplete version of Immortality spell which she modified and turned them into vampires .

Thus The Originals were created than when they completed their transition after drinking human blood and As nature seeks balance It also forced weakness on them , The sun Which granted them new life now burned , the ancient white oak tree which granted them Immortality could also take them away herbs which is Vervain also burned and they could not enter other's home unless invited .

Dave then asked them the question which will force them to a corner and tell him everything he wants to hear from them "Then why are you here disguised as Count Teqees's Children ."

I could see it in their eyes this question hit their sore spot . Then after glancing at eachother Rebekah was about to say it but Niklaus beat her into it .

Klaus : "Dave, you are a warlock right I need your help in something will you help me?"

Got 'em Dave was having a hard time keeping a straight face when he is inwardly grinning from ear to ear as he got Klaus to the point where he wanted them to be .

Dave: " Yes, I am but what does that have to do with why you are here disguised ."

"And what help do you want , I will try to do my best ."

As Klaus , Elijah and Finn were hesitating and looking at each other again Rebekah stepped in like a true angel and gave them a Reassuring look that Klaus then told me why they were here .

Rebekah glanced at Klaus, her eyes filled with concern. "NiKlaus, we should just tell him."

Klaus took a deep breath, his expression shifting to one of determination. "Very well. It all began after I completed my first kill under the full moon. I was transformed into a werewolf, a fate I had not anticipated as neither my father or mother were wolves .

Klaus continued, his voice steady but laced with emotion. "When my father, Father, saw me in that state, he realized something was amiss. He discovered that Esther had betrayed him. She had slept with a wolf, and I… I was not his son at all."

The room fell silent, the weight of Klaus's revelation hanging in the air. Dave's eyes widened as he processed the implications.

Elijah interjected, his tone somber. "Father, consumed by rage and humiliation, confronted Esther. In a fit of fury, he forced her to seal off Klaus's werewolf side, but that only fueled his wrath."

Evelyn: "That's cruel to do to seal half of him like that ."

Rebekah added, "In his rage, Mikael slaughtered the entire werewolf tribe, leaving no survivors. He was a man driven by ego and vengeance, and he took it out on the very beings that had once been part of our lives."

Klaus's voice grew heavier as he recounted the painful memory. "I witnessed it all. My mother's death at my father's hands as he ripped out her heart from her chest for betrayal and vowed to kill us and end everything he started ."

Dave's expression shifted from curiosity to sympathy. "And now he's chasing you to finish what he started?"

"Exactly," Klaus replied, his eyes darkening. "Mikael believes that by eradicating me, he can erase the stain of betrayal from his legacy. He wants to wipe us from the face of the earth."

Dave : "So you are all here Fleeing from your father who is chasing you to kill you."

Elijah "exactly."

Aurora: "But why did you run away , I mean he is just one person and you all are 5 ."

Elijah: "Father is a seasoned warrior and he was undefeated before transformation and now he is stronger and he also holds a white oak stake which is the weapon that can kill us ."

Rebekah : "One wrong step and we are dead so we are fleeing do not dare to confront him at all ."

Klaus: "Dave I want to get rid of this Seal that's keeping me from my true self."

Dave: "you want me to break the curse ."

Dave then to get his hands on her Grimoire told "I will do my best help you but."

Klaus : "But what Dave do you not want to help me , do you also think I am an abomination of nature and should be sealed like my mother Tell me!."

Dave holding back his grin "No it's not like that you're my friend and If a hybrid is an Abomination of nature then, what am I a immortal being who grows stronger with every girl Among the two of us Who do you think is more of an Abomination." Dave told to gain his trust more .

Klaus happy but confused "So what's the problem ."

Dave then began to hint his need "You see I recently awakened my magic after my grandma's death and all her Grimoire's were lost I don't have anyone to learn magic from and all I learned is some simple spells ."

"But to break your curse I need to know how the curse is and I am just a new witch I can't do it now."

Kol: "So that's it it's easy to solve I will teach you magic don't look at me now I was a prodigy before turning ."

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Give suggestions on how to replace the role Katherine had in the series as of Dave gets to her in 1400s she will no longer turn Stefan and Damon.

1.should it be her sister who closely resembles a Doppelganger almost a identical twin .

2.whole new character