The Rain definitely tackles these types of issues in its first episodes, which helps to build up these limited personalities, but at the end of the day, each and every character is far more concerned about surviving the damned outbreak than by “finding their meaning in the world,” or anything like that.
One of the most frustrating tropes of heightened teen dramas is the way both normal and overwrought teenage emotions are shoe-horned into post-apocalyptic situations.
Sure, teens are horny and angry and emotional all the time, but would anyone in a real life-or-death situation be focused on such everyday notions?