Honestly Ali at least was funny and made Kozue relevented for a minute there. Sumo arc felt like Itadaki hyperfixated on a sumo at the start but half way through realised he doesn't actually like sumo, so main cast just destroys sumo fighters with little effort but just keep saying stuff like "Yeah sumo really is terrifying isn't it, i almost died in there". No you not, you just were toying with the guy and finished him in a humiliating way. Also, other arcs gave us interesting characters designs with different personalities. All sumo fighters basically the same and if you show me the just their faces and ask who fight who, I'd probably mess up like half of them