The performer's agent, Peter Bennett-Jones, who owns his own management company, described his client as "an extraordinarily polite individual professionally".
Mr Bennett-Jones, who is chairman of Comic Relief, a governor of Rugby School and a trustee of the National Theatre, added that Collins had a "polite, respectful nature with everybody he has worked with".
"The behaviour I have read about and has been reported is inconsistent," he said, but acknowledged that he had not heard the recording of Collins's row with Ms Larke.
The trial will resume at 10am tomorrow when counsel will make closing speeches and Judge John Plumstead will sum up.
Comedian and television presenter Justin Lee Collins, 38, has been found guilty of harassing his former partner.
A jury has begun its second day of deliberations in the trial of television presenter Justin Lee Collins.
Television presenter Justin Lee Collins's relationship with an ex-girlfriend accusing him of harassment brought out "the demon" in him.