Important Characters

Arthur Dent Arthur in a pretty normal guy who is not prepared for any of the things that will happen to him through out the series
Ford Prefect Ford appears to be a human but is in fact from a small planet somewhere in the vicinity of Betelgeuse. he first met Arthur when he saved Ford from shaking hands with an oncoming car as he thought they were the dominant life form on earth.
Zaphod Beeblebrox Zaphod is Ford Prefects cousin. he is very charismatic and is now the ex-president of the galaxy. in the books he has who heads and three arms however the picture i will show is from the incorrect movie.
Trillian Trillian is a girl who Arthur was hitting on at a party, the problem was that she wanted to spontaneously go to Africa and he did not. then Zaphod shows up and says "is this guy boring you? come with me, I have a space ship" and he really did.
Marvin Marvin is a mechanicaly depressed android. that is honestly all you need to know to understand his role.