Grover is usually cheerful and upbeat, yet he chews on furniture when he is nervous. He cries when he is upset, which makes him an easy target for bullies. He can often be philosophical. He sometimes mopes around a bit though. He has an obsession with coffee (due to feeling the presence of Pan in New Mexico while drinking it), tin cans, and enchiladas. He believes that cheese enchiladas are better than chicken ones. This may be due to the fact he is a vegetarian. He is also an environmentalist. 