So like. If in canon Junko is a zombie and that means her arms and head and stuff can just...um. Be pulled off and reattached (because zombie) is it something that can be kept? She's not invulnerable or anything. I assume if someone really tried they could destroy parts of her body but she's canonly able to just...pop her head off then stick it back on afterwards. Usually this is just played for laughs and an inconvenience because she doesn't want her arm coming off while someone is trying to help her up but it's the sort of thing that happens anyway.