If they decide to make another anime what should it have?
There you go.
This is a bit of a non-sequitur, but you've just reminded me of an anime I've been watching called "Bungou Stray Dogs". During season 1 a lot of people were complaining about how a show focused on private detectives and the mafia was so light hearted...only for season 2 to come along and be incredibly dark and then people complained again that they liked the more optimistic nature of the first season. Can't please everyone I guess. ¯\_(ツ)_/¯It should be a dark story, it shouldn't be shy and safe and they should really put more effort into the fight scenes.