It's hard to go with just one character. But I find myself relating to the cynics a lot, such as Hank Moody, BoJack Horseman, Duckman and Squidward. Not that I'm necessarily as downbeat or troubled as they can be, but I can often empathise with the inner conflict, guilt and regret that they all go through to a lesser extent or more. Though with Squidward it's mostly wanting to fulfill an artistic dream (For me it's making movies rather than music) as well as being frustrated when people won't just leave me alone. As nice as SpongeBob is he would be unbearable to deal with in real life. There's nothing worse than people who just talk endlessly at length while you're trying to find some excuse to get away, or who make tons of noise when you want to relax.
Most relatable real-life person?