Recommendations Transmigrators that doesn't break characters

I'm looking for some quick transmigration that doesn't break characters so easily like for example the original host was a timid and shy kid but when the mc transmigrated, she became fierce/cold- I don't want that.
I want it to only have one interest, same person each arc.
If possible no unnecessary love triangle.
It can be bl or bg but not gl(I'm okay with gl but I'm not finding it today)
No tragic also sorry(^～^; )ゞ
Thank you( ◜‿◝ )♡

 

My Death Flags Show No Sign of Ending
The Villain Wants to Live
Tho they are transmigration and not QT.

 

Thank you(´∩｡• ᵕ •｡∩`)

 

There are quite a few novels where they have multiple transmigrators. A shit person on Earth is still a shit person on another planet, just a bigger shit because they got superpowers. Tate no Yuusha/ Rising of the Shield Hero is sort of like that. Reincarnators that are shits are still shits when they come on orders of the evil Bitch God

 

Thank you(ʃƪ＾3＾）

 

I think The Poor Baby’s Manipulation Manual fits. Its BL and not much is translated so try to MTL if you like.
BTW it's very tragic and yandere so please beware.

 

I'm okay with yandere but tragic hehe
(• ▽ •; ) but that you for recommending
♡(ӦｖӦ｡)

 

Mistakingly saving the villain hits all your requirements.

 

I already read it and honestly, I fell in love with that novel(｡・//ε//・｡) Thank you for recommending ( ◜‿◝ )♡