This page of the guide to Animal Crossing New Horizons describes Orville, a Dodo airline employee.
Orville is a cheerful bird who works at the airport - and that's basically all you can say about this character.
Where to find him?
You will meet Orville at the airport around the clock.
What can he do?
Speak to Orville if you want to travel - you can go to, for example, desert islands, which we have written about more here, or the islands of other players.
You will also send postcards to your friends or to the characters living on your island. Don't forget about that - postcards are great!