The first boss in my Sword of Dissonance game concept. I knew when I started this design, it's base form would be from a different character, so I worked that out before moving on to its current incarnation.
The third boss of my game concept, a colossal demonic entity that chases my main character throughout the level. In the early stages, I planned it as a machine-golem like creature, but decided it didn't really flow with the fantasy setting I established.