So many vehicles and buildings, so little time!
As for me, I'm a character modeler, but for now not of the human kind. My work on my very first character has been rather on and off, but I also decided to do the insane thing and go for a realistic character as my very first model, back before Blender supported sculpting and under its old UI. My original character has seen work on it recently, but I'm making a replacement because it has several geometry problems that snowball into a monstrous project if I try to fix them. Both characters are obviously a work in progress, the replacement model more so than the old one.
Old model -
New model -