persona grata
/pəˌsəʊnə ˈɡrɑːtə
/noun (plural personae gratae /-niː/ /-tiː/)
A person, especially a diplomat, acceptable to certain others: in my last term I became persona grata to a group of Newnham College girls
Origin
Latin, from persona (see persona) + grata, feminine of gratus 'pleasing'.