Well, if your japanese citizen (and was before monsters came to public) then you could be a host as you had lived amongst humans very long time (and basically count one for educating new monsters how live amongst humans and live in Japan). But your still under law that as a monster you cannot harm humans. Or it's easier if you were human but turned to monster, then they would treat you more human and allow be host (but still be under the law that no harm to humans allowed).<br/><br/>Also most likely those cases you would be part of M.O.N agency and nothing in M.O.N rules as I know forbids them being hosts (or government agents for the matter).