Stella Zhau (first introduced as "The New Girl") is a supporting character in The Loud House. She made her first appearance in "White Hare" with her face not shown, and her later appearance in "Be Stella My Heart" with her face shown.
In "White Hare", Lincoln wanted to make a good impression because of her arrival to town. However, the sisters encouraged him to be himself, since him being himself is enough to make a good impression. After barely catching up with the bus, Lincoln discovers Stella sitting alone, and offers to sit next to her, where she immediately gets charmed by Lincoln's personality, and offers him carrot sticks on the ride to school.
In "Be Stella My Heart", Stella arrives, asking Lincoln and his friends to swap lunches for carrot sticks. Later at Gym class, she asks them if she can take part on their Snake formation, but they are too awkwardly to talk to her and she steps back wishing them good luck. In Science class Stella asks them if they want a lab partner or she would be with Mrs. Johnson. Sometime later Stella asks Lincoln to come with her to Burpin' Burger after school and he eagerly accepts her offer. The next day while Lincoln was talking to his friends, Stella then asks Rusty to come with her to the Flea market and he accepts much to Lincoln's jealousy. Rusty then informs that he and Stella eat ice cream with waffle cones, She asks Liam to come with her to the mall and he happily accepts. Stella taps Zach in the shoulder and makes a pistol gesture, meaning asking for a laser tagging, which he accepts, much to Liam's jealousy. Stella taps Clyde in the shoulder and makes a little dancing asking to come to the arcade to play Dance Dance Revolution, which he accepts, enraging Zach, causing him to punch the drinking fountain hurting his hand in the process. When Clyde shows them that he and Stella playing the game, this makes them completely jealous. At Lunch, Stella was eating unaware that Lincoln and his friends are fighting over her. At Gym class, she and the other students watch Lincoln and his friends fighting each other over to her as Coach Pacowski rushes to them to break it up. Later Lincoln and his friends confront her saying they do not want more of her business and she explains that she only wanted to get along with them and sadly leaves to hang out with Mrs. Johnson. At Lunch Stella was eating her sandwich alone, Lincoln and his friends arrive to apologizes for perceiving her actions the wrong way, but she does not respond. They decide to leave thinking she was furious with them, but she asks them for a trade lunch and they accept, successfully rekindled their friendship, and shows them a new formation called the Scorpion formation, which they proudly accept.
In "Predict Ability" Stella complimented Lincoln wearing new outfits and enjoyed him coming to school every day in different clothes. At school, Lincoln chooses Stella as her partner in calligraphy practice. Later when Lincoln said he thinks he's boring because of his routines, Stella assured him that everyone has own routines and it doesn't make him boring.
In "Antiqued Off" Lincoln called Stella to invite her to stage magic show, but she excused herself that she has to help her grandmother. Later Lincoln met Stella and demanded explanation, why she lied to him. She admitted she lied to him, because she thinks stage magic is boring and didn't want to hurt his feelings.
In "A Grave Mistake" Stella was among the audience members attending the funeral of school mascot Ricky the Rooster.
Stella got a central role in "Tails of Woe". In it, she brings an antique music box to school for show-and-tell, but it goes missing. Stella's friends suspect its disappearance to be the work of the Rat Beast, a creature rumored to lurk in the school's vents. Stella leads the group in going down to the school basement to confront the Rat Beast and recover her music box. In the end, she and the gang learn that the Rat Beast, actually a two-tailed rodent named Cinnamon, is nowhere as scary as the legends made him out to be. At the end of the episode, Stella gives some of her corn chips to Cinnamon.
In "Stall Monitor", Stella plans to help stall for Lincoln's parent-teacher conference, only to have to leave early due to her father being attacked by Carol Anne.
In "Brave the Last Dance", Stella tests to see if Clyde's crush Emma likes him by reading his tea leaves. The tea leaves depicted Clyde dancing with a brunette girl and wearing a chef's helmet. Despite Emma only liking Clyde platonically, this fortune came true when he showed up to the dance in a chef's hat to redecorate the cake and ended up dancing with another brown-haired girl, Chloe.
In "Tough Cookies", she helps her friends bake cookies to sell and makes a conveyor belt. However, this ends up backfiring when Liam's cow kicks the conveyor belt, making a mess.
In "Friends in Dry Places", Stella goes to camp with her classmates. Lincoln worries that she will stop being friends with him due to Lynn mentioning drifting apart from an old friend in middle school and also due to Stella being too busy riding an ATV with Girl Jordan and Cheryl. He hatched a plan involving pretending to be lost, but ended up actually getting lost. Eventually, Stella and the others reassured Lincoln that they'd always be friends.
In "Schooled!", she and her other friends struggle in Lincoln's absence, and she briefly considers taking up his role as "woman with the plan". They eventually go to Canada to search for Lincoln.
In "Kernel of Truth", Stella finds an old newsroom at school, inspiring her friends to form a news group. She interviews Mr. Bolhofner and Chef Pat, then later helps her friends solve the mystery of the stolen popcorn.
In "Saved by the Spell", Stella and her friends tried to take part in Middle School Talent Show by dancing together. They wanted Lincoln to join them, but he preferred to work alone in his stage magic. Stella and the other friends were afraid of Lincoln humiliating himself during his performance, so they tried to discourage him. Stella disguised herself as a failed yodeling performer and successfully discouraged Lincoln by telling him a fabricated sad story. Lincoln finally agreed to join his friends until he found Stella's costume in her locker, so he was upset and left his friends. To apologize Stella agreed to volunteer in Lincoln's stage magic performance.
In "No Bus No Fuss", during school bus ride Stella and her friends were violently bullied by three 8th graders. They all tried to find safer way to school. In first week they asked their parents sans Stella's to drive them school, but they were too much distracted to drive them school on time. In next week they took city buses to go to school, but the plan was too much convoluted to work. They used Flip's offer to get to school by plane, but this was too dangerous as Flip's plane and parachutes were junk. Stella and her friends decided to suffer the bullies instead of taking another idea for alternative. It's revealed that after Stella and her friends stopped using the school bus, the 8th graders bullies started bullying other kids. Unable to see the other students suffer Lincoln came with idea to gang up against the bullies. Lincoln told the bullies to stop bullying them, Stella and rest of ther friends showed themselves up, later the other kids. The bullies realized they are outnumbered, so they stopped bullying.
In "Zach Attack" Stella agreed to help Zach keep charade of aliens visiting Royal Woods. She diguised herself as an alien and spoke alien language as Zach instructed her. However Zach's lie got revealed in the end.
In "Flying Solo" Stella with Rusty and Zach joined school home-ec club lead by Mr. Bolhofner. First they cooked food from bugs, later they made costumes for Lincoln and Clyde.
Stella is a tall slender Filipino girl, with tan skin, freckles, black hair that curls up at the back end with two strands of hair standing out, two pairs of eyelashes, and noticeably slanted eyes.
Her main attire consist of a white short-sleeved sweater, with a red star in the middle, a red collar, and red sleeve edges, a knee-long black skirt, white knee-high socks with a red and blue stripe at the top, and green sneakers. She also wears a wristwatch on her right hand and a red hair clip on the back of her head.
In "White Hare", she wore an orange headband with a bow, and had her hair tied up in a bun.