Eula Celeste Potter (nee Lockhart) was born on 27th August 1982 to author Gilderoy Lockhart and singer Celestina Warbeck after they had an affair. She attended Hogwarts School of Witchcraft and Wizardry between the years of 1993-2000, where she was sorted into Gryffindor and met her husband Harry Potter. She is a Half-Blood, like both of her parents. She was raised in Wales by her older half-brother.
Eula (pronounced you-la) and her husband, Harry, had three children: Freddie Rubeus (born 2009), Lily Hermione (born 2012) and Remy Luna (born 2015). They are named after significant figures in Harry and Eula's life: Fred Weasley, Rubeus Hagrid, Lily Potter, Hermione Granger, Remus Lupin and Luna Lovegood
Harry was with his Hogwarts girlfriend Ginevra Weasley and they had a son together, James Sirius (born 2002). They broke up in 2005 after an on-again-off-again relationship. Harry and Eula married in 2010, after the birth of their first child.
When Eula was little, her parents were often too busy for her (especially her father) and so she was mainly raised by her mother's son from her second marriage. They lived in Wales, as that was where Celestina lived.
Eula and her father had a very complicated relationship, made even worse when he lost his memory in an accident as a Professor at Hogwarts when she was ten. She was excited at the prospect of being taught by her father at Hogwarts, which became impossible when the accident happened. Eula, her half-brother and rarely her mother would visit Gilderoy at St Mungo's Hospital for Magical Maladies and Injuries.
Her parents were 47 years apart in age, with Gilderoy being 18 when she was born and Celestina being 65. She was conceived when Lockhart left a temporary love potion for one of Warbeck's young backing singers, which Celestina herself drank.
Eula also spent a lot of time with her father's two older sisters, her Squib aunts.
Amelie Brown, the younger sister of Lavender Brown, was a fellow Gryffindor in Eula's year and was one of her closest friends. Amelie was one of the few people who didn't tease Eula because of her father. They became firm friends when they were given detention by Professor Snape in their first year, which ended in them flicking beetle eyes at each other.
Leilani Fawley is a member of the Fawley family, one of the 'Noble Twenty-Eight'. It is tradition for Fawley family members to be sorted into Hufflepuff, however Leilani was sorted into Gryffindor in 1993 along with Eula. They were partnered together in Transfiguration in their first year and became friends when Leilani helped Eula turn a spider back into her quill.
Hermione was well known at Hogwarts for always being in the library, which is where she and Eula met. Eula was practicing spells from a book and Hermione (being Hermione) went to help her. From then on, they would recommend each other books and play wizard chess in the Gryffindor common room. They became even closer when Dumbledore's Army was founded, with both girls signing up immediately. They became closer still when Harry and Eula began dating, meaning Hermione and Eula saw each other more often.
Luna and Eula bonded on the Hogwarts Express in Eula's second year (Luna's third year) when Eula, Amelie and Leilani were looking for somewhere to sit on the train and saw that Luna was the only one in her compartment. The girls sat with Luna skeptically after hearing 'Loony Luna' rumours, but soon found that she was lovely and an amazing friend.