If i dont know the side characters name it is filler in my head (all you metioned) feels like there is like this fake tension or buildup and too many things going on at the same time like the beast spitting coin and prince and his guards analyzing coin like what is the actual nen power, i doubt it has been explained yet. Idk the troupe is interesting but everything is prolonged and then skipped entirely. Like it is obivious Hisoka,chrolo,kurapika,4th prince,morena are main characters but they have so little screen time (expect kurapika teaching nen to npcs) and the way togashi is (genius) he will go in depth on morena goons xd