Originally Michi Shimura (志村美智 Shimura Michi), Trixie is Speed’s chaste girlfriend. The “M” adorning Trixie’s blouse stands for Michi. Michi would often fly around in a helicopter during a race, advising Speed Racer via a radio link to the Mach 5, in effect acting as his spotter, a function she also serves in the live-action film during the Casa Cristo 5000. In the manga it is mentioned that her father is the president of Shimura Aviation, which explains why she owns her own helicopter. Further implying that she is a “rich girl”, she can also be seen driving a Mercedes (in the anime; in the manga, it is a generic symbol not representing any car company). A recurring event, used to add comic relief in the anime, is when Trixie becomes jealous and arrogant if Speed is appalled or enthralled by another beautiful girl or when she is ignored or left alone. In the 2008 live action film, she is portrayed by actress Christina Ricci. She had a reddish brown bob cut with bangs; in the anime, her hair was dark brown.
Unlike most female characters in cartoons at that time, Trixie is not portrayed as a helpless perpetual victim in need of saving. Trixie often proves herself the equal of Speed when forced into physical altercations. While Trixie has been captured on occasion by the villains, she refuses to cower or plead for her release, more often giving the bad guy a serious tongue-lashing until she is either rescued or escapes on her own. On some occasions, Trixie has even been the one to rescue Speed or other male characters from their predicaments.”