After making a Mal Reynolds amigurumi as a gift, I have now developed the crochet pattern and it is for sale in my Etsy store and on Ravelry.
Mal is the captain of the spaceship Serenity in the SF show Firefly, played by Nathan Fillion. He's heroic and good-hearted, though he generally operates on the wrong side of the law. My crochet pattern lets you make a cute version of him, about 6.5"/16 cm tall, with a removable coat and gun in a holster.
I am now working on another Firefly character, Jayne Cobb, so the pattern for him should be ready soon. Let me know which other characters you'd like me to design.