Adrian Edmondson
In the episode "Flood", he develops a potion to transform a person into an axe-wielding homicidal maniac (he claims "it's basically a cure... for not being an axe-wielding homicidal maniac... the potential market's enormous!"). He has more friends than the others but apparently "he doesn't like any of them." He frequently causes havoc or damage such as wiring the doorbell to a bomb to "pep it up a bit" and adding a small car engine to the vacuum cleaner as previously it "looked a bit on the tentative side" - which then proceeds to suck up the carpet, the floorboards and a friend of Neil's (the vacuum also prompted one of the few clashes between Vyvyan and Mike; when Mike admonished Vyv not to use it anymore, Vyv replied by calling him a "poof").