Maeve would not last a single day, I love my girl but she has absolutely no survival skills :(
Haruki would maybe last a week, he'd be disgusted at the prospect of not taking a shower, and there's no way you will catch my man fighting, he's more survive and run away
My other ocs (I for the life of me can not figure out a name for her) would survive like a six months, she could take out zombies easily, but will sacrifice herself for whoever she teams up with in a heart beat, by herself she might last a long time, a year??