When I look at gates I always find myself wishing for a certain theme and i started to wonder what does the community like.
I found myself liking the devlites and gremlins. The gremlins are like the main antagonists so I just enjoy fighting them because it's like a rivalry between knights and gremlins. I like the devlites because of the way they are organized and interact with each other. I think it's kind of funny that there is a boss and some suck-ups that follow him around and then there are other workers that rage when they have to work overtime.
So just post your favorite monster(s) or theme(s) and why you like them (if you want).
I really like Ice and Castle style levels, partially for the music and partially for the design. It has an aura about it that calms me.