Eiji Kitamura is a user on toot.cafe. You can follow them or interact with them if you have an account anywhere in the fediverse.
Nico video started integration with Mastodon. Nico video is very popular video streaming service in Japan. Interesting they put nico video as an id provider to use Mastodon.
http://www.itmedia.co.jp/news/articles/1704/19/news136.html