Wow, rippa decor you have here.
I spent the last 6 years or so trying to find a Japanese forum or chat (ever since WBS died) using every alternative I could think of in every search engine I could find - no flaming luck.
Then I look for "manga onomatopoeia" in Google, and (by way of a site that turned out not to do what I needed) I wind up here. Not only that, but the first post I see on arrival bears an Australian flag.
So - g'day all.
I'm an older type person, and don't know Japanese at a usable level yet. Self study of Japanese is not easy.