Hi,
recent discussion:
https://tails.boum.org/forum/IRC_Client:_Please_include_something_other_than_Pidgin/
I recommend XChat as IRC client. XChat is also used in aos:
http://aos.sourceforge.net/
XChat has been configured to spill as little information as possible
about the user. Tails and aos could share the same anonymity set.
XChat config files are also here:
https://github.com/adrelanos/aos/tree/devel/aos_workstation/usr/share/aos/xchat2
Just look into it, it's documented why each setting has been chosen:
https://github.com/adrelanos/aos/blob/devel/aos_workstation/usr/share/aos/xchat2/xchat.conf
I wrote a script to reset xchat's settings to a clean state:
https://github.com/adrelanos/aos/blob/devel/aos_workstation/usr/local/bin/xchat-reset
There is a big article about XChat in tpo wiki:
https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/XChat
There is also a big article about IRC in general:
https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/IrcSilc
Parts of it may be useful for documentation.
Cheers,
adrelanos