Fonick Treacle was created as a entry in the October '04 Blackwyrm Lair modding contest. He was created in four days, and the content reflects as much.
Fonick will banter with practically everybody in the party (except Yoshimo and Imoen) and he also has a few talks with the PC. He is not romanceable as he's too much in love with himself, with the rest of his affection being directed towards Laura Renop of Velesk. You must complete a very small quest in order to pick him up.
As for particulars, Fonick is a lawful good bard (I think) who has his own (rather useless) kit and a (completely useless) wooden sword. His statistics are terrible, but he might amuse you for a minute or two.