KKYU

I only know of Regas, but it is transmigration

Also Im camping because others might rec

What is isekai ???

The MC was transferred to another world

For example: MC from earth transfers to a magical world (similar to Reincarnated as a Slime)

Reincarnation in the same world counts as isekai too ??

No, the reincarnated as a slims talks about the MC coming from earth then after death, got transferred in a magic world where he became a slime

Which is why regas doesnt count as isekai also

I feel like body swap/ reincarnation trope is a bit more common than isekei bls but here are some ik of:

https://www.mangago.zone/read-manga/don_t_press_the_button/

https://www.mangago.zone/read-manga/to_deny_the_route/uu/br_chapter-190799/pg-1/

https://www.mangago.zone/read-manga/sweetie_sweetie_sweetie/uu/br_chapter-163908/pg-1/

https://www.mangago.zone/read-manga/the_yandere_top_fatger_is_being_teased/

Alright thank you Fluffball Sama

Intoxicated (or Ni Jiu)
Mc is an omega who got isekaied to a normal non omegaverse world.

this one is literally everything you just mentioned although it's a bit... uh... stupid. comically stupid

just don't take it too seriously and you'll be fine

https://www.mangago.zone/read-manga/love_remedy_1/

Monochrome rumor
Meteor orbit
Secretary to stage

idol - in my closet
omegaverse - origin of species, instant family