From Wonder King Online Wiki

Join us on the Unofficial Wonderking IRC!

Server: irc.deltaanime.net:6667
Channel name: #WonderKing
Status: Inactive

On this IRC you can also find WonderKing Trivia which pulls data from this site and the official wonderking site.

If you're Japanese and need Japanese chat, Unofficial Wonderking IRC for Japanese is the following:
Server: irc.smile-box.net
Port: 6663
Channel name: #WonderKing_En