RUKI!!!!! .... okay, that said I think Frog will be terrified of him (which is humourous given Frog is now a Lost and strong and all that crud.... but yes, he'll revert back to imaginary and fearful of crazy boy).
He will likely get along with a new guy I'm bringing in. Pike he might butt heads with (who doesn't) and Mao will be unclear how to take him.