melissa finds that she always needs to be liked and can't handle the fact that not everybody will enjoy her company. she's not a fake person, though; she'll just always be kind and positive to people because she doesn't understand why some people don't respond well to it. she's especially stumped by ren in step one, when they simply don't want to be friends with no clear explanation.
i hope i understood the question properly! your ocs all sound very different and interesting.