Ambassador Matthew Carpenter, who is calm and has a level temper. Usually.

Sort of like a small terraformed Mars that can teleport between universes. We don't have control over the world engine, so don't blame us if we appear in orbit around your planet.

This nation/world is always orbiting around some version of Earth (Unless there is no Earth in that universe), so the sudden appearance of this world in a universe usually has nasty tidal consequences on an Earth that doesn't have a similar Moon already.