Who is the "dumb blonde" character in Nickelodeon's "The Loud House"?

The dumb blonde character in Nickelodeon's "The Loud House" is Leni. Leni is depicted as the family's fashion-obsessed, style-conscious teenager who often lacks common sense, being oblivious to sarcasm or misunderstands simple instructions. Her character is characterized by her ditzy personality and frequent inability to understand or grasp complex concepts, making her come across as the "dumb" blonde in the show.