My man, definitely check out Monster. It's a masterpiece. And Johan is amazing. He has no superpowers. I don't wanna spoil it for you, but it's a warm recommendation. Like others have said, it's definitely worth checking out, and you should avoid spoilers. It's not even long, the anime has 74 episodes and the manga iirc 162 chapters. In my opinion this is Urasawa's best work.
20th century boys have a better story and a better supporting cast
But monster has a better main protagonist and main antagonist
both are goats
And number 1 and 2 on my list of the greatest manga I have ever read