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assuming it's something that wouldn't be able to be shown on TV, the Japanese audience goes down significantly.
If you had a pilot written up already, put it up for community critiquing, and let it get worked over and over throwing suggestions at it, and making it a community project. everyone involved would feel a lot more attachment to the project. it would also give you hundreds of contributors to its idea board. just take aspects of the best ideas and writing styles and put them into the story.
as it grows, artists will start to draw renditions of the characters, and THAT'll pick up momentum too. eventually you'll have a solid story, with concept art, and basically a light novel. you'll have a following. and you'll have a solid pitch to any interested studios.
if you're serious about it, write up a pilot, and then try to make a thread here with it.