I did watch some anime as a kid (Pokémon springs to mind) but I think the first one I really watched as an adult was JoJo's Bizarre Adventure. A friend recommended it to me, and boy was I in for a wild ride! I still feel very fond of it, though I'm not enjoying the last season(s) as much. I don't think I've actually finished watching the last one. But the earlier parts will forever hold a special place in my heart!