TBH the main thing I kinda miss about classic Robotnik is that he would often be drawn with this goofy face proportion where his mouth was invisible, which I felt made him look like some sort of mysterious creature more than a person lol
I really like Cryogonal. It's such a weird guy and it's also canonically a predator. They have a pleasing shape and weird face energy nature. Also they're a pure Ice type, which is extremely tragic from a gameplay point of view but extremely neat too.
I have been doodling random weirdos in the same paint program for 15 years now. I like to think I am at least a little better than I was when I made these guys in middle school but who can say