Mine would be something in Lain-style, most likely... Less hi-tech, maybe something with a surreal feeling to it. Also with some retro element, maybe not set in a precise era. I like the idea of mixing elements from different sources and cultures, but I wouldn't like it to look like a ridiculous mess. Everything must fit and not be excessive in a story. If it has to be a little excessive, it has to be for a reason, not simply to hide an uninspired work. I would also avoid stereotypes of any kind, so no much action , no love stories either, no heroes trying to save the world etc. The plot could be not so clear, especially at the beginning. I'd like some sort of suspense to make people wonder and follow the proper times of narration. It'd probably suck overall
But honestly, if given the chance to create my own series, or at least to write a screenplay for some anime/manga, that would be the choice for the the content and its style.