Worldbuilding Galore

Dark/Angsty Manga with lots of gore that is very storybuilding.
All characters being humanized mushrooms (that are still life mushroom sized) and goes into describing the lives and discrimination of poisionous mushrooms by non-poisionous mushrooms + huge journey of self-discovery and acceptance and mc highkey falling in love with the guy who killed her family... idk, its good tho .

Reincarnation as a Slime. Highly reccomend not only for its isekai but its in depth worldbuilding, relationship building, mapping, etc. The story elements are honestly some of the best noted and the author leaves nothing to be desired with how much they go to cover every part.
MC is OP if thats not up your alley, but I think the author handles it well because Rimuru at times struggles and is incapable of handling his own power and is mainly reliant on his peers and subordinates.

Follows a Prince as he's banished to a far off island to be a feudal lord and discovers the powers of his crest (something that allows incomprehensible power), as well as a long forgotten ancient city on very said island.