Poor, poor Eeyore. Fans may write off his sadness as slight and occasional melancholy or think that he has a flair for pessimism. It turns out there's a psychiatric diagnosis with his name on it. Same with Bugs and a number of other cool cartoon characters. Many speak of the stigma of mental illness; it may be that the popularity of these long suffering, brave souls will affect positive change in that regard. See more cartoon characters whose personailities line up with DSM-V entries here.