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Well, I'm into characer growth but not particular the op part. Usually that is where I drop the series. The things I recommend could be completely different than what you wanted to read, sorry about this. I've used isekai a lot, but idk if I use the term correctly but oh well.
Have added some some recs based on emotional character growth however. Hope it's to your liking!
Shounen-ish things... (I am very bad in genre division, sry)
- Beastars!
coming of age, animal society, furry-ish I guess?
- Psyren
standard action-adventure shonen with growth in abiities. I hope this gets an anime sometime...
- Kumo desu ga, nani ga?
isekai with game mechanics, focus on abilities and cheating the system. Dropped it a few chapters ago.
- Kingdom
warring asian states, historical, growth in abiilties
- The beginning after the end
reincarnation: king into boy in a fantasy world (currently dropped)
- To You, The Immortal
about an immortal alien-thingy that can shapeshift into others. Interesting so far but dropped it around ch 100
- Saijaku teima wa gomi hiroi no tabi o hajimemashita .
about a scavenger girl, interesting so far, only a few chapters, kinda rebirth theme.
Shoujo / josei
- Koushaku Reijou no Tashinami
isekai with the girl starting a cooperation and establishing trade
Slice of life / josei
- Houro musuko
coming of age of a transsexual boy.
- Blue Period
a boy attemts to become an artist. this is harder than you think.
- Arte
a girl attempts to become a craftsman in the renaissance where there is lots of gender bias.
- Kakukaku Shikajika
a girl attempts to become a manga artist.
- The Great Merchant Kim Manduk Manhwa
about a girl who becomes an important merchant
Seinen
- Kokou no hito
a guy finds his ikigae: (outdoor) climbing
- Real
about wheelchair baseball, lots of character growth
- Afterschool War Activities
a bunch of kids are drafted into the army during an alien invasion
Other non-manga recs:
Webnovels
- Worm
Dark hero universe. Tons of character and ability "growth" and world building.
- a practical guide to evil
A world where everyone is born with "labels"of vilians and heroes.
Fanfiction
- Dreaming of Sunshine
Naruto fanfiction based on character growth.
Anything with great character growth from weak to OP(▰˘◡˘▰)