Lucy Loud/Relationships

Her siblings generally
As she is introduced in "Left in the Dark", Lucy has always been overlooked or not noticed by her siblings in cases where all of them are relevant, this is presumably what first made her a goth. She constantly scares them by appearing next to them unnoticed, and tells them her gloomy poems she writes. Although she is the deepest of the Loud kids, she loves and respects her siblings very much and vice/versa and she'll help them in whatever trouble they have. As a common Goth, she's simply not good in expressing emotions.

Lincoln
They don't share the same interests but they get on well with each other; however he hates it when she scares him. Lucy sometimes asks Lincoln for help to create rhymes for her poems. Despite her "spooky" personality, Lincoln seems to appreciate her and he tolerates her creepy hobby and she's glad for his tolerance.

She and Lincoln are so close that she's eager to tell him about her bad dreams as shown in "Sound of Silence". In many episodes she comes to Lincoln to ask him for proper rhyming words. In "Roughin' It" it's revealed Lincoln makes her manicure much to her joy.

Once he invited her to play in ghost hunting but she refused explaining they are her friends. In "Sleuth or Consequences" she clogged the toilet which leads to Lincoln being wrongfully accused. She tried to help him clear his name so he could go to the comic book convention, but also tried to frame her other sisters. When Lincoln discovered she's guilty, he was angry at her for lying to him and wasting his time. She begged him not to tell anyone in order to save herself from humiliation for the rest of her life, and he took the blame himself. She was grateful to him so she showed her appreciation for it by giving him her homemade horror comic, which he accepted with pleasure.

In "Space Invader" during the food fight Lincoln accidentally threw a meatball at Lucy when he was targeting Lynn. Lucy didn't mind it because he didn't do it on purpose, but Lynn's laughing bothered her more and so then she threw meatball at Lynn and sarcastically laughed. Because the sisters' room was too dirty to sleep there they both asked Lincoln to let them sleep in his room and he agreed to the offer.

In "Heavy Meddle" she, along with all her other sisters, got excited when she thought Lincoln's bully was picking on him out of affection. When Lincoln went to kiss the bully, the other girls cringed at their brother's pain, but Lucy grinned at it.

Lori
Lucy and Lori very rarely interact. Like with all the siblings Lori is freaked out whenever Lucy appears out of thin air and Lucy doesn't like when Lori is bossy. In "Changing the Baby" Lucy warns Lori that their late great-grandmother was furious that Lori gave away her prized brooch, which frightens Lori and prompts her to get it back. In "A Fair to Remember" Lucy helps Lori with her relationship with Bobby, and gives Clyde a gift on Lori's behalf as a thank you for helping her.

Luna
They don't have many interactions but in "Slice of Life" Luna shows that she doesn't like Lucy's speaking with ghosts.

In "Picture Perfect", they both comment on how ugly Lincoln's coffee mug he originally planned to give his parents looks.

In "House Music", they wrote the lyrics and tune for their song, "Plastic Bag Blown Through The Gutter Of Life".

Lynn
Due to Lucy having to share a room with Lynn, they look to be on good terms. However, because of their differences sometimes they discuss and finish fighting. In spite of that, the two girls respect and love each other mutually.

In "Space Invader", Lynn and Lucy have a discussion over how they can't stand each others lifestyles and habits. Lucy can't stand Lynn's energetic and sporty demeanor, and Lynn can't stand Lucy's depressing and negative vibes. Due to this, Lynn goes to sleep with Lincoln, much to his annoyance. To get rid of Lynn, Lincoln tries that she and Lucy reconcile with a dinner, which finishes in a food fight. During this food fight Lincoln accidentally threw a meatball at Lucy when he was targeting Lynn. Lucy didn't mind it because he didn't do it on purpose, but Lynn laughed which bothered her more and so she threw a meatball at Lynn and sarcastically laughed. After the fight, Lucy and Lynn reconciled and they slept with Lincoln after their room is a mess.

Lana
They don't have many interactions but in "No Guts, No Glori" and "A Tale of Two Tables" they both enjoyed food fight.

Lola
They don't have many interactions but in "A Tattler's Tale" Lola blackmailed Lucy to make her drive her toy car. In "Roughin' It" it was revelated Lucy is also afraid of Lola's anger as she played dead to avoid her.

Lisa
They don't have many interactions but they argue about their believes in supernatural phenomenas like fortune telling in "Raw Deal".

Lily
She and Lucy have a good relationship. In "Changing the Baby" Lucy tries to implement her interests on Lily, because she had nobody that shared her likes. In "Linc or Swim" Lucy took care of Lily by rubbing her body with sun oil.