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.
The jury wrote down more than a dozen questions for the defendant this afternoon.
They spotted that in response to Ms Larke's 103 text messages, Collins had replied with 114, and signed off: "Speak tomorrow, gorgeous."
Asked to explain, he said ignoring her texts did not work, and: "I still had feelings for her, I still loved her."
The court has heard Collins refer to "blacks" and "chinks" and Ms Larke alleged he had "a problem with people of colour".
He denied that and today said: "Anna would use racist terminology if she could."
Television presenter Justin Lee Collins's relationship with an ex-girlfriend accusing him of harassment brought out "the demon" in him.Read the full story ›
Comedian and television presenter Justin Lee Collins has never hit anyone in his life, he told his trial for domestic and emotional abuse today. The 38-year-old is accused of slapping and harassing his ex-girlfriend, Anna Larke, during their nine-month relationship.
Today, police interviews the star gave after his arrest were read to the jury at St Albans Crown Court. In them Collins told officers that Ms Larke, a recovering alcoholic, was possessive of him and believed he was going to go off with other women.
Ms Larke has claimed Collins attacked her in their Miami hotel room in March 2011. Today, Collins said he had only ever slapped Ms Larke to calm her down when she was self-harming, which he claimed she did, once gouging her wrists and threatening to commit suicide.
The girlfriend of Justin Lee Collins was accused of trying to blackmail the comedian.
Anna Larke, 38, was asked whether she had threatened to report the former Friday Night Project host to the police if he did not give her £20,000 after they broke up.
Sonia Woodley QC, defending Collins, 38, said: "You told him 'Give me £20,000 or I'm going to hurt you and I'm going to go to the police."
Miss Larke, who alleges Collins harassed and assaulted her during their nine month relationship, said: "Oh my god that's absolute lies. I've never said that"
Ms Woodley said Collins texted her back saying 'I've offered you all sorts of help but I'm not getting involved in blackmail'.
Larke told the court: "If I had just wanted money I would have gone straight to the press."
Collins, of Kew, denies one charge of harassment by causing her fear of violence.
Comedian Justin Lee Collins is to stand trial for allegedly harassing his former girlfriend.Read the full story ›
Comedian Justin Lee Collins is to stand trial for allegedly harassing his former girlfriend.
The Friday Night Project host from Kew, who is 37, has denied putting ex-partner Anna Larke in "fear of violence" between January and July last year.
Collins appeared at St Albans Crown Court for a plea and case management hearing, where the case was adjourned for trial at St Albans Crown Court on September 24.
The 37 year old spoke to confirm his name and to plead not guilty to a charge of harassment, causing fear of violence.
Collins was granted bail on condition that he does not contact Ms Larke or her relatives.