I greatly enjoy coming up with my own unique characters and stories, and I have quite a creative mind. I also have a knack for writing dialogue (or so I've been told), which is good because I'm also interested in film-making and theatre (and thus writing film and play scripts). I'm actually planning to rewrite a friend's screenplay for a short film she planned, and to write my own original short film as well which I hope to actually shoot sometime early next year. So yes, I enjoy writing for pleasure. I certainly don't do it for money, though I do sometimes post my works on the internet (generally both here and on Deviant Art) for people to read and give constructive criticism on. I have something of a fascination with the darkness inherent (I believe, anyway) in every single human. I tend to come up with characters first and a basic story, then I add these characters and think "what would they do now?", except I often give my work something of a dark twist and bring out the hidden sides of my characters, and explore what they would do given the temptation to commit more sadistic and brutal acts than a normal, sane, person would do.
To be fair I've also done a little dabbling in poetry, writing a poetic piece about the G20 protests and the death of Ian Tomlinson (it's on my Deviant Art page - same name as on here, i.e. 'Trivun' - if you want to take a look, along with almost all of my other stories). I also started a fanfic yesterday, having never done one before. The first chapter is on Fanfiction.net under my name, Trivun, and is a little piece based on two of the side characters from the Halo background stories (namely Tom and Lucy, and their friendship and early days as SPARTAN-IIIs). I'm also planning a fanfic based on Higurashi No Naku Koro Ni, namely a new arc exploring what would happen if Mion was the killer - basically Watanagashi-hen with some key differences at the start, preventing Shion from becoming insane and allowing Rena and Keichii to pursue a relationship together fairly unhindered... hehehehe... ;D.
TL;DR: Yes, I do write for fun and I have plenty of stuff already written or planned, as listed above. Woot.