I love many things about it.
- the characters, they are so themselves, unique and realistic. even the secondary characters in my opinion
- the improvement of the characters - especially at Barnaby, Karina, Origami, Kotetsu and to some degree at Lloyds too (towards Kotetsu's way of thinking and working lol)
- I really like how some characters' (including villains) past are revealed, showing what made them become what they are in the present time of the show.
- the humor. not overdone, well-timed.
- no offense, but in the case of
this show I really like there are
absolutely no overdone geistures, caricature stuff like huge sweatdrops, veins, huge mouth, eyes, chibification, big tear-rivers, huge blushes etc. I saw only about one such (when Nathan snores in disappointment and he has a pig-nose for a moment
xd ) but otherwise I saw nothing else like that.
- the amount of fillers/serious parts or episodes. I think none of them is too much and they are timed well
- the story. not very American-like, but interesting, and it has components that might remind you of other shows, but it's still unique
- I also really like how some characters embody different theories, opinions (about justice or what it means to be a hero)
- the details. once I've read an article of how many hidden stuff were there, it was entertaining to notice afterwards,
see here if interested
- the music - although many of them are really recognizable when you heard them few times already, I still love them a lot
- voice acting (Japanese) - I think it's excellent, the tones are realistic (I'm not Japanese)