Klaus and Hope

“My dearest Hope. My littlest wolf. My miracle child. What a gift to be able to leave you one last message. So please carry it with you in the years to come. I want you to know this. You will make mistakes in your life. That comes with being a Mikaelson. You will go through hard times. For no one with your power always knows how to use it properly. You will find love and you will lose it. For such is the burden of immortality. But the most important thing about your life is that you live it. Because you are my Peace. And I regret a lot of things, but I don't regret a single moment I spent with you. I love you so much. Always and forever.“
The father-daughter relationship between the Original hybrid, Niklaus Mikaelson, and the tribrid, Hope Mikaelson. Hope is Klaus' only child with Hayley Marshall-Kenner.
Though initially uninterested in having a child of his own, Klaus soon changed his mind, not wanting his child to suffer what he had to endure with his own step-father, Mikael. Because of that, and in spite of the fact that Hope's blood can be used to sire Hybrids, Klaus has made it clear that he doesn't want to abuse or in any way take advantage of his daughter's existence. He was forced to send her away to live with her aunt Rebekah to protect her from those who would try to harm her, or those who would target her for being a Mikaelson.
Klaus and Hayley decided to work together to make New Orleans a safe home for Hope. They took control of the supernatural factions in the city. Once they accomplished this plan, they intended to bring Hope back to New Orleans to live with her mother and father.
When Hope came home, she lived in New Orleans with her mother and stepfather, in an apartment across the street from Klaus and the Mikaelson family. She was under the protection of her father and the Crescent pack.
However, due to many events and a brewing war between Marcel Gerard and Klaus, the Mikaelson siblings were forced to neutralize themselves while Hayley searched for a cure to Marcel's venom. Hayley told Hope stories of her father, and he became her fairytale Prince. She eagerly awaited the day when she could be reunited with her father.
They were separated for five years until Hayley finally awakened Freya who cured Elijah, Rebekah, and Kol so that could save Klaus together. Klaus was brought home by his family and, despite initial nervousness on both sides, Hope and Klaus reunited and shared a lovely, peaceful day together. Hope became infected with the power of the Hollow, a power that put her life in danger. To save Hope, Klaus and his siblings each took a portion of the Hollow's power within themselves and separated to different corners of the world. If they came in close proximity to one another, or to Hope, the consequences were dire. As a result, Hope and Klaus were forcefully separated.
Seven years later, Klaus had not seen or spoken to Hope in five years. They were briefly reunited in New Orleans because of Hayley's disappearance. Following Hayley's death, Klaus raised Hope as a single parent, as they grew closer and better understood one another. They repaired their formerly-strained relationship, and Hope took the power of the Hollow back inside herself, which allowed her and Klaus the chance to grow closer. They shared moments of father-daughter intimacy, with Klaus helping Hope through her first transition as a werewolf and comforting her when she felt hopeless. However, the power proved too much for Hope and began to kill her. Klaus had Alaric Saltzman's twin daughters put the Hollow into himself, so he could sacrifice his life for Hope. Hope was distraught by this, but she spent a few precious last moments with her father before he, and Elijah, sacrificed themselves. Before his death, Hope promised to carry on the Mikaelson legacy and to make Klaus proud of his only daughter.
In Death Keeps Knocking On My Door, the Necromancer reveals to Hope that Klaus watches over her constantly and doesn't regret his sacrifice. However, the Necromancer mentioned that Klaus will not find peace unless Hope does.
They are known as Klope (Klaus/Hope).