Dame Lettuce is known for being a bit ditzy, and speaking in a stereotypical valley girl accent. She thinks quite highly of her appearance. She also has a major crush on Sir Tomato, which is the basis for most of her decisions. It is possible that her ditzy behavior is just an act that she puts on. For example, on page 480 she is scolding Sir Tomato for kicking Sir Bacon out of their trio in a serious manner but then makes a face and finished off her speech with "or, like, whatever??".