As revealed in episode "Home of the Fave" he used to favor Lynn Sr.'s sibling over him. He's very caring towards Lynn Sr. and his grandchildren. Like his son, he gets very emotional over stuff. Prior to the events of "Camped" he used to be a fisherman and because of this, he hardly got to see his family.
Leonard made his full appearance in "Camped!". Lynn Sr. video calls him to tell him about Camp Mastodon closing but is unfortunately cut off due to bad connection. He appears later in the episode and saves the family along with the camp's treasure by catching them on his boat. At the end of the episode he decides to quit his job as fisherman and becomes the new proprietor for Camp Mastodon after Mr. Rinsler retired.
His appearance looks similar to a 1970s hippie. He has white hair, a white mustache, and goatee. He wears a tan bandana, and circular glasses with purple lenses. He also wears a purple long sleeved shirt, with an orange vest, blue pants, and red sandals. He also wears a peace necklace. He has similar facial features to his son.
However, in Lynn Sr.'s flashback in "Home of the Fave", his silhouette has shorter curly hair.
A flashback of him with a young Lynn Sr. in "Camped!" shows him looking almost identical to the fully-grown Lynn Sr., except that he has a beard much larger than the mustache he had in the flashback shown in "Vantastic Voyage". In the present, his hair and beard are grayish. He wears a orange parka, brown pants and light blue sneakers.
He's the first of the Loud family's paternal relatives to make a physical appearance in an episode.
He is also the first of Lynn Sr.'s relatives to be confirmed to still be alive.
Like Albert, it's unknown if his wife is still alive.
He was possibly born in Royal Woods, and his son Leonard was Lynn Loud Sr.'s father. He hand-me-downed Vanzilla to his son, but this seems unlikely, as that would suggest that it goes farther back than that type of vehicle would have existed.
His appearance looks similar to a 1950s greaser. He has black hair, that has been applied with grease, and styled into a pompadour. He wears a black leather jacket, with a white shirt underneath it, blue jeans, a black belt, and black boots. He has similar facial features to his grandson.
The 1600s version of Leni was a distant ancestor of the Loud family. She first appeared in The Loud House Movie.
Leni's ancestral double is known to have been just as ditzy and fashion-oriented as Leni is. According to Morag, she was known in Loch Loud for her fashion skills, and her ghost is seen admiring a dress along with Leni and Scott.
The 1600s version of Luan was a distant ancestor of the Loud family. She first appeared in The Loud House Movie.
Luan's ancestral double is known to have been just as much of a comedian as Luan is. According to Morag, she was known in Loch Loud for her wisecrackery, and in the film's epilogue, she is shown juggling with her descendant.
The Duke was an ancestor of the Loud family, and the former (and final for 400 years) Duke of Loch Loud.
According to Angus, Lincoln's ancestral double was a stout-hearted boy whose name was known for his noble deeds. He is shown to be quite humble in recognizing the innter qualities of other people, as he recognizes Angus as a worthy successor as the Duke of Loch Loud.
Lucille looks very similar to Lucy, but she has completely different hairstyle that contains bangs covering her eyes.
She wears pearl-pink old-fashioned long dress with V-shaped cut on her chest, long-sleeved shirt and knee-long socks in black and white horizontal stripes, purple shoes.
Lucille and her family used to live the high life, with her brother as the Duke of Loch Loud. But then, 400 years before the events of the movie, the whole family was driven away by Aggie, the castle caretaker, who only wanted peace and quiet. Later, the family tried going back home to Loch Loud until Aggie brainwashed Lolo the dragon into taking away the Duke’s crown. Lucille's final fate, along with that of the rest of her family, remains unknown.
She is the only Loud ancestor to be voiced by a different actor/actress.
Great Grandma Harriet is a minor character, and part of the Loud family. She is deceased, as Lucy speaks to her "ghost".
Not much is known about her, except that she's a deceased relative of the Loud family. Lucy still treats her as a living person, which indicates that, (assuming Lucy and her siblings knew her when she was still alive) she and Lucy were very close.
In "Snow Bored", Lucy fruitlessly calls her great-grandmother to save her and Lynn from Lisa's incoming big snowball.
In "Spell It Out", it is revealed that she once owned a spell book, meaning that just like Lucy, she was also interested in occultism.
In "Tea Tale Heart", Lucy finds a doll in one of Great Grandma Harriet's trunks in the attic.
When Harriet was a child, she bears a striking resemblance to Lucy, with a few exceptions: Harriet was seen wearing white pearl earrings just like Lola's, a pearl necklace, a black dress with a brown waistband and brown cuffs, and a brown 1930s hat, as opposed to Lucy's outfit.
So far, she has only appeared in a photo.
She is the first mentioned deceased character belonging to the Loud family.
"Spell It Out" reveals that she resembled Lucy at a young age. It seems (though she's deceased) she is closest to Lucy, as they look and act alike, and form a somewhat spiritual connection.
Shirley is the Loud kids' aunt (it is unrevealed what side of the family she is on), who first appears in the episode "Picture Perfect".
Very little information is known about Shirley, other than she is either Lynn Sr.'s or Rita's sister/sister-in-law.
She first makes a brief cameo in "Picture Perfect", where Luna compares Lincoln's homemade coffee mug to her, in the sense that both look ugly.
Shirley is a very repulsive woman, with fair skin, curly red hair and a mole on her left cheek. She wears an olive toned dress with light green spots, three golden bracelets on her right arm, olive green studded earrings, pink nail polish and pink lipstick.
Lori, Luna, and Lola generally don't treat their items like real people, but are known to on occasion. Leni, Lucy, and Lily, however, actually have romantic feelings for their items. In Lucy's case, it's because the Edwin bust represents a character from The Vampires of Melancholia, who Lucy has a crush on.
The Loud parents were the only adults in Season 1 whose faces were never shown. Their faces are later revealed in Season 2, though there are afewinstances in the first few episodes of Season 2 where they are still hidden.
Rita is the only family member in the immediate family whose first name does not begin with "L".
So far, only the Loud siblings have alternate versions of themselves.
Rita and Lynn Sr. call the Loud siblings by the false middle name Marie when they are in trouble. Lincoln's actual middle name is Albert after his maternal grandfather. The sisters' actual middle names are unknown, but all except Luna, Lola and Lisa are confirmed to have the middle initial L.
Five of the Louds have phobias:
Lynn Sr. is dentophobic, samhainophobic, and arachnophobic.
Every year before returning to school, the siblings go clothes shopping and don't buy anything unless every sibling approves. Lincoln hates these trips as he has to carry the sisters' bags and they like to dress him up.
According to Savino, while doing punch-up writing on the Loud House pilot script, Scott Kreamer was the one who suggested that "Loud" be the family's last name, in accordance with the title.
According to Michael Malone of Broadcasting+Cable, the alliterative theme was partly a reference from Karla Sakas Shropshire's family. Her father is named Karl, and her siblings are Karlena, Karli, and Karl Jr.
The Loud Family was also a name of a power pop band active from 1991 to 2006.
However, despite the fact that Rita mentions that her family is from Royal Woods in the movie, it was already implied in the series that she had Scottish heritage, too, as Albert used to wear a kilt.
The Loud Family has a collection of images and media that can be viewed here.
↑Sometimes, Lily is associated with white, such as in the mobile game Outta Control.