Not trademark law, but the law as to what extent a fictional character may be based on a real person is always of interest.  A non-fiction book portrayed, in part, plaintiff.  The book was sold to Paramount, which produced “Hardball.”  Keanu Reeves plays the part of a character who appears to be based on plaintiff, with a couple of unflattering characteristics thrown in.  Plaintiff sues for libel, defamation and related claims.  Seventh Circuit analysis here.  Muzikowski v. Paramount, No. 01-4314 (7th Cir, Mar 6, 2003).