I did this thing on twitter where I assigned people I know ben 10 aliens. This was just a joke but then continued to me quickly drawing 'fusions' of the aliens I assigned. I did try and inject their style and likes into these.
This turned out to be quite a valuable experience, much like a month prompt list, I was able to experiment with different ideas and methods, but I did it in my own time and there was no time limit- so mega casual
I found myself liking the idea of making aliens take on the attributes/proportions of other aliens more interesting that doing a straight up fusion.
I found it way more engaging making an alien look like an individual of one species rather than two species mixed together.