is there any good novel with the "reincarnated/transmigrated to a novel world as a fated to perish villain" troupe where instead of the MC take over the body control, they just got trapped in the body with the owner still got control. kinda like a novel with MC having/being a system with a host where instead of giving abilities/mission it gives info about the future instead. bonus point if they have good monologue like Kumo Desu ga, Nani ka?
MC got two souls in him and all three interact and to each their strong points, it is quite nice albeit the novel translation seems to be on hiatus , you can read the manga if you want https://mangadex.org/title/15359/isekai-tensei-soudouki
If you're into otome game and villainess noble girls than how about Haunted Duke's Daughter? It's about a villainess hearing a voice inside her head warning her about the future if she does not change
There’s “Akuyaku Reijou ni Nanka Narimasen. Watashi wa『Futsuu』no Koushaku Reijou desu!” Where the MC coexists with the original host, although the MC is in control... I would not recommend it, though.
Akuyaku Reijo Ni Koi Wo Shite and My Death Flags Show No Sign of Ending have aspects of it but in the end the personalities end up merging to create a new personality. There was also Headless Villainess but after asking for permission from the author and not getting it the translator pulled it.
thank you for the suggestion. i've read the manga until the latest chapter (47) and it's interesting so far thanks for the suggestions. from the synopsis and review the one that interest me the most is Akuyaku Reijo Ni Koi Wo Shite, but i think it doesn't hurt to have more waiting list to read