|Online Appearance?||Yes (as Mr. Lowry)|
Mr. Darnell (also known as Mr. Lowry in the online book) is the teacher in charge of Independent Study, an experimental class that started during the third quarter. He appears in Diary of a Wimpy Kid.
At the beginning of class, Mr. Darnell assigns the class to build a robot. When everyone starts freaking out, he tells the class that they just have to get ideas for what they want a robot to do, not build a robot from scratch. He then leaves the room.
When Mr. Darnell returns at the end of class, he goes to the table that all the boys in the class are working at and looks over the paper they'd been writing on, which is full of swear words a robot shouldn't be able to say. As a result, Independent Study is ultimately canceled for all of the boys for the rest of the year.