This is the only anime I've ever seen that has every aspect of what I like about anime, the world building, the way they gain their powers and power-ups and the way that's all mapped out is super interesting, each character is a world of its own you really feel like you're living through these characters and the psychological twists keep this anime new every second, every episode awakens something else until it's just a full-blown masterpiece
This is the only anime I've ever seen that you end up feeling the same way about the good guys as the bad guys, the development and depths to their character, sides to their personality, and you can empathize with how each of their experiences change them.
The depth and detail of their psychological changes, you know every thought in their head but there's never too much dialogue, it's all natural but is one of the deepest anime I've ever seen! The evil guys are so evil but the way they learn is mystic and viewers experience their philosophy change unlike any villain I've ever seen on TV, I'm mainly talking about the Ant arc which is the second to last one. I love the main characters, our heroes, so much but I have to say and I think almost everyone agrees that they like Meruem better (the bad guy)