Comedian Frankie Boyle has denied "punctuating" material with racist references or making "gratuitous" use of black people.
He told the High Court that characters he played might express racist views but he did not.
He was giving evidence on the third day of a trial in London after complaining that the Daily Mirror libelled him by describing him as "racist comedian Frankie Boyle" in an article.
Boyle said he has actively campaigned against racism and parodies racists - and claims the newspaper "misunderstood" the context of his use of language in jokes.
Daily Mirror publisher Mirror Group Newspapers (MGN) is defending its article, published on July 19 2011.