For comedy and action, plus you've seen Ranma 1/2, I would suggest Maze. There are a few different 'seasons' of Maze, none of them really coincide with the others as far as I can tell.
The premise is a girl finds herself in a strange world and ends up meeting this Princess. The problem? When night time hits our main girl becomes a guy with a completely different personality (and some pretty strong powers). There's some mecha involvement, and more interesting characters, but I don't want to give away too much.