Self-destructive mc’s

Typical, reincarnated into the world of a novel i read as a side character that all the main characters now like but her desperate to please personality really showed how much they care about her. Also, shows insight into the world of a “pet” as a survival tactic

Mc isn’t exactly self-destructive, but she’s on a time limit that she and every one else is very much aware of so she keeps saying things like she doesn’t want to regret anything (in this life cuz she reincarnated)

Mc reincarnates as a side character that has a terminal illness (?) or just a weak constitution. Pushes away others due to trauma from her parents (mostly mom) from her past life and also from acceptance that she’ll die soon so whatever happens she might achieve will be temporary. Cue loving friends and “family” lol