-Arnold Rimmer (RD: Thanks for the Memory)
Yvonne McGruder was Red Dwarf female boxing champion.
McGruder was Arnold Rimmer's sole, brief sexual liaison. ("Thanks for the Memory") This event took place from March 16th of an unstated year from 7:31 p.m. to 7:43 p.m., this counting the time it took to eat the pizza afterward. She had been under the effects of a concussion at the time due to being hit on the head with a winch, and as a result had some problems thinking and thus kept calling Rimmer by the name of "Norman". This has led to great teasing towards Rimmer about it from Dave Lister. ("Confidence and Paranoia")
McGruder appeared in Rimmer's Better Than Life simulated reality (the only time that McGruder has actually appeared in the television series). First in his car, a Jaguar, where they had sex, then later pregnant, surrounded by a hoard of unruly children virtually sired by Rimmer. ("Better Than Life")
McGruder was later mentioned by Lister in the Series VIII episode "Back in the Red, Part One" in Lister's and Rimmer's cell in The Tank, saying he'd previously had a relationship with her before she went out with Rimmer. In a (very successful) attempt to infuriate Rimmer into speaking, he described his sex life with her in great detail, including a mention of carpet burns. Whether Lister actually went out with her is never clarified, since he was trying to aggravate Rimmer, although it is also quite possible considering the great amount of sexual relationships Lister has been in.
In the deleted scenes of the Series VIII episode "Pete I", it is revealed that McGruder was also resurrected by the nanobots (although she remains unseen) and has entered into a relationship with Officer Denton. Finding Denton frozen in time by the Time Wand, a jealous Rimmer takes the time to play a prank on the frozen Denton.
In the Doug Naylor novel Last Human (which takes place in an alternate universe to the television series) McGruder is depicted as having ended her relationship with Rimmer without much note. Upset by Lister taunting Rimmer that she only slept with him due to a concussion, he decided to wait for her to call him back instead of seeing her himself. It is also mentioned in the book that Yvonne had a crush on Rimmer and thought the liaison was all in her head due to the concussion and hoped that he would call her and prove it was all real. When the call never came the affair ended before it even began and all that persisted was the odd smile whenever the two passed in a ship corridor. She is depicted as having survived the Cadmium II by not being on board the ship at the time, pregnant with Rimmer's child.
Based on the need for a strong father figure for the young boy, Michael McGruder, Yvonne regaled him with fictitious stories of bravery and triumph as Rimmer rose to greatness in the Space Corps. These stories did indeed lead the boy to a successful military career which led him to be selected for a mission on the Mayflower to create a new home for humanity in the face of the then doomed Earth. Learning about the holographic reincarnation of his father from the recovered Red Dwarf black box, his ambition was to meet his father (a person he still felt less successful than). When he did meet his father, his illusions were shattered. Things were changed in the end as Rimmer won his son's respect by sacrificing himself to save Michael and others from the Rage.
When Rimmer breaks the news that what Yvonne had told him was a lie he stressed her parenting abilities and stated that he was amazed at how good a job she had done in raising his child. He also expressed a twinge of regret that he had not also survived, given that she would have likely called upon him again.