About me: Beetlejuice (also known as Betelgeuse in the first film) is a trickster and mischievous ghost.
Beetlejuice is a very rude, crude, and womanizing ghost. He also gets a little crazy at times. Though he seems fun on screen, it is clear he is not a pleasant person to have around in real life, as he constantly invades people's personal space, does disgusting things like spitting in his own coat and makes rather rude gestures.
He loves to scare people and pull pranks on them. He also appears to be quite selfish, as his main goal in the movie is to lift his curse and escape no matter who gets hurt in the process. He has the attitude of a sleazy used car salesman.
Ironically, Beetlejuice is a corpse who eats insects, including flies and beetles. He could be 600 years old as derived from his line after scaring the Deetzes as a snake implied “I'm feeling a little anxious, if you know what I mean, It's been about 600 years.” Although his age has never been officially confirmed this line could be the best approximation of his age, which would make his birth at the time of the movie somewhere around mid 1300 A.D if he died in his 30’s.
Though there was no attempt to hide the fact that Betelgeuse was not meant to be a nice character, even the heroes who summoned him knew that he was, pretty much, a demon.
Despite his malicious nature, Betelgeuse also acted as a benefactor of sorts to the heroes. He was still used as a force of (relative) good, as his chaos was directed largely at a group of human antagonists, though he was still rude, obnoxious, and hostile towards the heroes as well.
He shows an interest in Lydia during most of the movie, and at nearly the end of this movie, he tries to force her into marrying him to fulfill a contract. He almost succeeds until he is stopped by Adam and Barbara Maitland, as well as a sandworm.
