Gilbert will do anything to become strong, and has an arrogant attitude, believing that he is the best and still more "awesome" than others, although he hasn't really succeeded at his goal. Although he proclaims to like being alone. It is revealed that he had kept diaries since he was formed, which led to him having an entire library of journals. Almost all of them start with passages that read "I'm so cool/I was so cool today". He also seems to be fond of cute things, and buys things such as stuffed pandas, as seen on his April Fools Blog. In addition, on his blog, he says he's fond of sleeping, fighting, and eating. He seems to have a tendency to sneeze and find himself bored with or distracted from tasks, especially reading, although he claimed to be "a wiz at cleaning" and also seemed to be good at gardening, so it's possible his skills show when he is less distracted.

