Agnes Johnson (more commonly referred to as Mrs. Johnson) is a minor character in The Loud House. She is the teacher of Lincoln and Clyde's fifth-grade class.
Agnes seems to have a nice personality, however in the episode "The Green House", at the end she can be selfish, as revealed in said episode after naming the baby polar bear after herself.
In "Along Came a Sister", it's shown that she tends to spend some of her weekends in a rather unusual manner when she refers that while Frank can't be left out of his cage, she says unlike her, and chuckles slyly, meaning she has a secret wild life that her students wouldn't understand at their age.
In "Dance, Dance Resolution", she acts as the chaperone for the Sadie Hawkins Dance, and holds a raffle drawing to see who spends lunchtime in the teachers' lounge with her, showing that she enjoys her students' company outside of class. She also enjoys dancing to the music.
Her wild life is brought up again in "Study Muffin" when she breaks her leg after riding a mechanical bull. With that, she hires Ms. DiMartino to substitute for her while she recovers.
Agnes wears a light green turtleneck sweater, a dark green skirt with a black zigzag stripe, and a gold circle belt chain. She has dark pink hair, which is wrapped into a bun, and held together by a pencil. She also has light blue eye shadow, but in both "Frog Wild", and "Shell Shock", she doesn't have her eye shadow.
Despite going by "Mrs.", Agnes seems to be single, as evidenced in "Lincoln Loud: Girl Guru" when Coach Pacowski offers her flowers and she accepts them (implying that she has a crush on him), or she could be divorced.
Her first name is also revealed in that episode.
The zigzag black line on her skirt looks similar to the zigzag line on Charlie Brown's shirt from Peanuts.
Out of all her students, Lincoln seems to be one of her favorites.