If we're listing series' we've watched, read through, et al:
Read
Dorohedoro. It's... a trip, to put it lightly. Noi is NO1 and all that, but I'll admit that the second half gets a bit
off between reading it between update stretches and that it seems to be a little too quick to go "Eh, Magic User Society as a whole wasn't all that bad". But it has some pretty decent characters, the design for Curse is just [chef kiss], and its comparisons as "Berserk for people who've aged beyond High School" tend to be accurate enough. Speaking of...
Berserk. To give a free Controversial Opinion: Not much a fan of it post-Black Swordsman arc. Specifically everything that happens after the Berserker Armor is acquired. Up until that point (up to and including its acquisition, sort of)? Excellent, great fun. You would not think you could have such enjoyment of a universe saying "Fuck this character in particular". Has some... sketchy moments, before then (even more sketchy character designs), but not enough to break the work. After that point it... kind of unravels. A lot. And by that I mean a C-list side character from around the point I said things fall apart? They become arguably
the most interesting one at this point (Silat, for reference), outside one-off "Yeah!" moments (Like the slap that echoed across social media for about two weeks). Everyone wants Guts to stab them with his Dragonslayer, including the blatantly underage characters, and that just kind of... makes it hard to enjoy everything from that point on. It's like the final season of Game of Thrones, only instead of a final and partial season it's about 1/3 of the series.
Delicious in Dungeon. Starts very light hearted, gets... unexpectedly heavy, but overall a solid recommendation to people.
Fist of the North Star. To continue something people may begin to be noticing a pattern with: I'd recommend sticking to the first series / part, as well as some of the Gaidens (Keep in mind that the Rei Gaiden is drawn by a notorious hentai mangaka so it may give you whiplash like a motherfucker). The second series is basically a rehash of the first but with less of its charm (Though Ein is a treasure second only to the likes of Shu and Fudou), and has some pretty questionable choices in having one of the characters from the first series get the hots from Kenshiro in a manner that's
extremely questionable. Oh yeah, it also hasn't necessarily aged the best in general since it was made in the 80's, but it has some character gems and it's great for getting familiar with where a lot of modern Shonen tropes originated.
One-Punch Man (Webcomic). I specify webcomic as I feel like Murata's treatment of it - while interesting in some regards - kind of miss a few points of the series and have some fairly obvious "Editor stepped in because every Shonen Manga needs an [x] arc". Has some... questionable, decisions even in the original (And by that I mean
holy gods if Murata changes the Origin of Darkshine Alloy I'll take back everything I said about them without hesitation and his attempted salvaging of one of the top A-Heroes was far too needed, but saying more gets into one of the subjects warded off by OP), but everything up to and through the Garou arc is generally solid enough.
Mob Psycho 100. Handled
infinitely better by ONE than O-PM, and overall a pretty solid (and complete: Including its side-stories!) series. Also, both its anime seasons are consistently top notch, and Redraw Reigen was a gift to the world. The Netflix adaptation should be avoided at all costs. The Stageplay is
worth finding a way to watch. Also avoids one of the biggest hang-ups of series' like BNHA, namely "Has a majority minor cast but
doesn't try to make the audience get the hots for them / have a Perverted Comic Relief character" (admittedly the latter is Shonen baggage in general, so I can't really diss BNHA for that one specifically).
Vinland Saga. Like
Dorohedoro, often described as "
Berserk for those who left High School". This is a bit deceptive, as after the prologue
Vinland Saga shifts
hard in themes (or, more accurately: Gets to the point of why those themes suffused the prologue), but honestly good enough to sucker people into the series. Does not have anywhere near as much baggage as either of the two other series' mentioned in this specific entry (even if the first flashback does have an... unfortunate, moment involving Leif), and generally it's worth watching Thorfinn's development from childhood into adulthood (as well as meeting the various side characters along the way). Also Thorkell punches a horse. If you've not seen anything else from the series, you've probably seen at least that.
Trying to remember any other major (or minor) series' I read all the way through. I
want to say I read
S-cry-ed, but the fact I can neither remember nor offer any commentary probably says all that needs to be said. Definitely recall reading some
Inuyasha when younger, but nowhere near completely and see
S-cry-ed commentary. Junji Ito's works, maybe? Definitely read those, though I'd hesitate to recommend those (Yes: In a ost wherein I included
Dorohedoro and
Berserk) on a public forum for
rather obvious reasons. Oh! There's
Way of the House Husband, that one's pretty solid (if very episodic).