Kidhauer is the fan-given nickname of a student at Tom Landry Middle who resembles Jeff Boomhauer. Fans speculate Boomhauer is his biological father. Kidhauer has never had any major role in the series. He appears sporadically throughout the series and is occasionally given a line to say. When he speaks he sounds normal and does not resemble Jeff Boomhauer's unique and fast-talking style. He is almost always is seen wearing a beige shirt and denim shorts. In earlier episodes, he appeared to be a good friend of Bobby Hill's, but he eventually became just a background character. His name was never revealed. When he spoke his voice was provided by Brittany Murphy or Lauren Tom.
- He is almost always seen with a T-shirt with the letters "K," and "H," on the chest, which may be his initails.