1x singer with alcohol issues - never knew if he would turn up or in what state. Obviously performance suffered too
1x guitarist that could never end a solo without the rest of the band shouting "for f***s sake stop"
1x keyboard/band leader who after nearly 3 years of weekly rehearsal still thought it was a bit soon to start thinking about booking gigs
Apart from those though, I've been in 2 bands for the last 30 odd years, same line up apart from the drummer (who over the course of 10 years turned from a nice chap into an egotistical and spiteful t**t!) The new one is cool