Dour, cranky, cold-hearted ... nihilists are pretty much portrayed as sociopathic versions of Eeyore.
The Cartoon That Does It Better:
One of the best things I've ever seen on TV was the Rick And Morty (i.e. subject of the deadly Szechuan Sauce Riots of 2017) episode "Rixty Minutes." Summer, Morty's older sister, discovers that her birth was an accident which, it appears, made her parents' lives worse. Morty then confides in her that he's not the guy she thinks he is, and that he's actually a Morty from another dimension who replaced the Morty she knew after his death. He ends this story by saying, "Don't run. Nobody exists on purpose, nobody belongs anywhere, everybody's going to die. Come watch TV."
That's where they leave it. There's no happy, "This was all meant to happen!" revelation later. She has to come to terms with the fact that nothing was meant to happen ... and that's OK. That is, in fact, the running theme of Rick And Morty. Yes, life has no higher meaning and nothing ultimately matters, except the things that matter to you. Rick, being a godlike multidimensional supergenius, knows for a fact that nothing was meant to happen. But he once killed a jellybean king because he suspected he had tried to molest Morty. It's, uh, a little hard to convey out of context.