Will would bring Little John and they would have a good time.

Quentin would bring Raj who would tease him about Yamato.

Cassian would bring Kay who would have opinions but mainly like it.

Charles wouldn't bring anyone as Hank's here, but he'd try and somehow get Raven and Erik to come back to Milliways.

William would bring Mark who would be glad to know that his brother's found Milliways. He does know of it but hasn't been in.

Moist and Demeter wouldn't bring anyone.

Sameth would bring Ellimere who would lecture him for not telling her and then I think it would be good for their relationship.

Ivan would maybe tell and bring Gregory, but he likes having a place not everyone knows.

Tumnus would bring Lucy.